Maths-
General
Easy

Question

The vector i with minus on top cross times left square bracket left parenthesis a with ‾ on top cross times b with ‾ on top right parenthesis cross times i with minus on top right parenthesis right square bracket plus j with ‾ on top cross times left square bracket left parenthesis a with ‾ on top cross times b with ‾ on top right parenthesis cross times j with ‾ on top right square bracket plus k with ‾ on top cross times left square bracket left parenthesis a with ‾ on top cross times b with ‾ on top right parenthesis cross times k with ‾ on top right square bracket equals

  1. 0    
  2. left parenthesis a comma b right parenthesis b    
  3. b    
  4. 2 left parenthesis a cross times b right parenthesis    

The correct answer is: 2 left parenthesis a cross times b right parenthesis

Related Questions to study

General
Maths-

O A B C is a tetrahedron in which O is the origin and position vector of points A,B,C  are i with ˆ on top plus 2 j plus 3 k with ˆ on top comma 2 i plus a j plus k with ˆ on top and i with ˆ on top plus 3 j with ˆ on top plus 2 k with ˆ on top respectively. A value of a for which shortest distance between O A and B C is square root of fraction numerator 3 over denominator 2 end fraction end root

O A B C is a tetrahedron in which O is the origin and position vector of points A,B,C  are i with ˆ on top plus 2 j plus 3 k with ˆ on top comma 2 i plus a j plus k with ˆ on top and i with ˆ on top plus 3 j with ˆ on top plus 2 k with ˆ on top respectively. A value of a for which shortest distance between O A and B C is square root of fraction numerator 3 over denominator 2 end fraction end root

Maths-General
General
Maths-

𝐓𝐡𝐞 𝐧𝐮𝐦𝐛𝐞𝐫 𝐨𝐟 𝐰𝐚𝐲𝐬 𝐢𝐧 𝐰𝐡𝐢𝐜𝐡 𝐭𝐡𝐞 𝐟𝐨𝐮𝐫 𝐟𝐚𝐜𝐞𝐬 𝐨𝐟 𝐚 𝐫𝐞𝐠𝐮𝐥𝐚𝐫 𝐭𝐞𝐭𝐫𝐚𝐡𝐞𝐝𝐫𝐨𝐧 𝐜𝐚𝐧 𝐛𝐞 𝐩𝐚𝐢𝐧𝐭𝐞𝐝 𝐰𝐢𝐭𝐡 𝐟𝐨𝐮𝐫 𝐝𝐢𝐟𝐟𝐞𝐫𝐞𝐧𝐭 𝐜𝐨𝐥𝐨𝐮𝐫𝐬 𝐢𝐬

𝐓𝐡𝐞 𝐧𝐮𝐦𝐛𝐞𝐫 𝐨𝐟 𝐰𝐚𝐲𝐬 𝐢𝐧 𝐰𝐡𝐢𝐜𝐡 𝐭𝐡𝐞 𝐟𝐨𝐮𝐫 𝐟𝐚𝐜𝐞𝐬 𝐨𝐟 𝐚 𝐫𝐞𝐠𝐮𝐥𝐚𝐫 𝐭𝐞𝐭𝐫𝐚𝐡𝐞𝐝𝐫𝐨𝐧 𝐜𝐚𝐧 𝐛𝐞 𝐩𝐚𝐢𝐧𝐭𝐞𝐝 𝐰𝐢𝐭𝐡 𝐟𝐨𝐮𝐫 𝐝𝐢𝐟𝐟𝐞𝐫𝐞𝐧𝐭 𝐜𝐨𝐥𝐨𝐮𝐫𝐬 𝐢𝐬

Maths-General
General
Maths-

T𝐡𝐞 𝐧𝐮𝐦𝐛𝐞𝐫 𝐨𝐟 𝐰𝐚𝐲𝐬 𝐢𝐧 𝐰𝐡𝐢𝐜𝐡 𝟓 𝐢𝐝𝐞𝐧𝐭𝐢𝐜𝐚𝐥 𝐛𝐚𝐥𝐥𝐬 𝐜𝐚𝐧 𝐛𝐞 𝐤𝐞𝐩𝐭 𝐢𝐧 𝟏𝟎 𝐢𝐝𝐞𝐧𝐭𝐢𝐜𝐚𝐥 𝐛𝐨𝐱𝐞𝐬, 𝐢𝐟 𝐧𝐨𝐭 𝐦𝐨𝐫𝐞 𝐭𝐡𝐚𝐧 𝐨𝐧𝐞 𝐜𝐚𝐧 𝐠𝐨 𝐢𝐧𝐭𝐨 𝐚 𝐛𝐨𝐱, 𝐢𝐬

T𝐡𝐞 𝐧𝐮𝐦𝐛𝐞𝐫 𝐨𝐟 𝐰𝐚𝐲𝐬 𝐢𝐧 𝐰𝐡𝐢𝐜𝐡 𝟓 𝐢𝐝𝐞𝐧𝐭𝐢𝐜𝐚𝐥 𝐛𝐚𝐥𝐥𝐬 𝐜𝐚𝐧 𝐛𝐞 𝐤𝐞𝐩𝐭 𝐢𝐧 𝟏𝟎 𝐢𝐝𝐞𝐧𝐭𝐢𝐜𝐚𝐥 𝐛𝐨𝐱𝐞𝐬, 𝐢𝐟 𝐧𝐨𝐭 𝐦𝐨𝐫𝐞 𝐭𝐡𝐚𝐧 𝐨𝐧𝐞 𝐜𝐚𝐧 𝐠𝐨 𝐢𝐧𝐭𝐨 𝐚 𝐛𝐨𝐱, 𝐢𝐬

Maths-General
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General
Maths-

𝐓𝐡𝐞 𝐧𝐮𝐦𝐛𝐞𝐫 𝐨𝐟 𝐰𝐚𝐲𝐬 𝐭𝐨 𝐟𝐢𝐥𝐥 𝐞𝐚𝐜𝐡 𝐨𝐟 𝐭𝐡𝐞 𝐟𝐨𝐮𝐫 𝐜𝐞𝐥𝐥𝐬 𝐨𝐟 𝐭𝐡𝐞 𝐭𝐚𝐛𝐥𝐞 𝐰𝐢𝐭𝐡 𝐚 𝐝𝐢𝐬𝐭𝐢𝐧𝐜𝐭 𝐧𝐚𝐭𝐮𝐫𝐚𝐥 𝐧𝐮𝐦𝐛𝐞𝐫𝐬 𝐬𝐮𝐜𝐡 𝐭𝐡𝐚𝐭 𝐭𝐡𝐞 𝐬𝐮𝐦 𝐨𝐟 𝐭𝐡𝐞 𝐧𝐮𝐦𝐛𝐞𝐫𝐬 𝐢𝐬 𝟏𝟎 𝐚𝐧𝐝 𝐭𝐡𝐞 𝐬𝐮𝐦𝐬 𝐨𝐟 𝐭𝐡𝐞 𝐧𝐮𝐦𝐛𝐞𝐫𝐬 𝐩𝐥𝐚𝐜𝐞𝐝 𝐝𝐢𝐚𝐠𝐨𝐧𝐚𝐥𝐥𝐲 𝐚𝐫𝐞 𝐞𝐪𝐮𝐚𝐥 𝐢𝐬

𝐓𝐡𝐞 𝐧𝐮𝐦𝐛𝐞𝐫 𝐨𝐟 𝐰𝐚𝐲𝐬 𝐭𝐨 𝐟𝐢𝐥𝐥 𝐞𝐚𝐜𝐡 𝐨𝐟 𝐭𝐡𝐞 𝐟𝐨𝐮𝐫 𝐜𝐞𝐥𝐥𝐬 𝐨𝐟 𝐭𝐡𝐞 𝐭𝐚𝐛𝐥𝐞 𝐰𝐢𝐭𝐡 𝐚 𝐝𝐢𝐬𝐭𝐢𝐧𝐜𝐭 𝐧𝐚𝐭𝐮𝐫𝐚𝐥 𝐧𝐮𝐦𝐛𝐞𝐫𝐬 𝐬𝐮𝐜𝐡 𝐭𝐡𝐚𝐭 𝐭𝐡𝐞 𝐬𝐮𝐦 𝐨𝐟 𝐭𝐡𝐞 𝐧𝐮𝐦𝐛𝐞𝐫𝐬 𝐢𝐬 𝟏𝟎 𝐚𝐧𝐝 𝐭𝐡𝐞 𝐬𝐮𝐦𝐬 𝐨𝐟 𝐭𝐡𝐞 𝐧𝐮𝐦𝐛𝐞𝐫𝐬 𝐩𝐥𝐚𝐜𝐞𝐝 𝐝𝐢𝐚𝐠𝐨𝐧𝐚𝐥𝐥𝐲 𝐚𝐫𝐞 𝐞𝐪𝐮𝐚𝐥 𝐢𝐬

Maths-General
General
Maths-

𝐒𝐢𝐱 𝐱′ 𝐬 𝐡𝐚𝐯𝐞 𝐭𝐨 𝐛𝐞 𝐩𝐥𝐚𝐜𝐞𝐝 𝐢𝐧 𝐭𝐡𝐞 𝐬𝐪𝐮𝐚𝐫𝐞 𝐨𝐟 𝐠𝐢𝐯𝐞𝐧 𝐟𝐢𝐠𝐮𝐫𝐞 𝐬𝐮𝐜𝐡 𝐭𝐡𝐚𝐭 𝐞𝐚𝐜𝐡 𝐫𝐨𝐰 𝐜𝐨𝐧𝐭𝐚𝐢𝐧𝐬 𝐚𝐭𝐥𝐞𝐚𝐬𝐭 𝐨𝐧𝐞 𝐱. 𝐓𝐡𝐞𝐧 𝐭𝐡𝐞 𝐧𝐮𝐦𝐛𝐞𝐫 𝐨𝐟 𝐰𝐚𝐲𝐬 𝐝𝐨𝐢𝐧𝐠 𝐬𝐨 𝐚𝐫𝐞

𝐒𝐢𝐱 𝐱′ 𝐬 𝐡𝐚𝐯𝐞 𝐭𝐨 𝐛𝐞 𝐩𝐥𝐚𝐜𝐞𝐝 𝐢𝐧 𝐭𝐡𝐞 𝐬𝐪𝐮𝐚𝐫𝐞 𝐨𝐟 𝐠𝐢𝐯𝐞𝐧 𝐟𝐢𝐠𝐮𝐫𝐞 𝐬𝐮𝐜𝐡 𝐭𝐡𝐚𝐭 𝐞𝐚𝐜𝐡 𝐫𝐨𝐰 𝐜𝐨𝐧𝐭𝐚𝐢𝐧𝐬 𝐚𝐭𝐥𝐞𝐚𝐬𝐭 𝐨𝐧𝐞 𝐱. 𝐓𝐡𝐞𝐧 𝐭𝐡𝐞 𝐧𝐮𝐦𝐛𝐞𝐫 𝐨𝐟 𝐰𝐚𝐲𝐬 𝐝𝐨𝐢𝐧𝐠 𝐬𝐨 𝐚𝐫𝐞

Maths-General
General
Maths-

The number of positive integral solutions of x subscript 1 end subscript plus x subscript 2 end subscript plus x subscript 3 end subscript less than n where n is positive integer, is

The number of positive integral solutions of x subscript 1 end subscript plus x subscript 2 end subscript plus x subscript 3 end subscript less than n where n is positive integer, is

Maths-General
parallel
General
Maths-

f𝐨𝐮𝐫 𝐛𝐨𝐲𝐬 𝐩𝐢𝐜𝐤𝐞𝐝 𝐮𝐩 𝟑𝟎 𝐦𝐚𝐧𝐠𝐨𝐞𝐬. 𝐈𝐧 𝐡𝐨𝐰 𝐦𝐚𝐧𝐲 𝐰𝐚𝐲𝐬 𝐜𝐚𝐧 𝐭𝐡𝐞𝐲 𝐝𝐢𝐯𝐢𝐝𝐞 𝐭𝐡𝐞𝐦, 𝐢𝐟 𝐚𝐥𝐥 𝐦𝐚𝐧𝐠𝐨𝐞𝐬 𝐛𝐞 𝐢𝐝𝐞𝐧𝐭𝐢𝐜𝐚𝐥

f𝐨𝐮𝐫 𝐛𝐨𝐲𝐬 𝐩𝐢𝐜𝐤𝐞𝐝 𝐮𝐩 𝟑𝟎 𝐦𝐚𝐧𝐠𝐨𝐞𝐬. 𝐈𝐧 𝐡𝐨𝐰 𝐦𝐚𝐧𝐲 𝐰𝐚𝐲𝐬 𝐜𝐚𝐧 𝐭𝐡𝐞𝐲 𝐝𝐢𝐯𝐢𝐝𝐞 𝐭𝐡𝐞𝐦, 𝐢𝐟 𝐚𝐥𝐥 𝐦𝐚𝐧𝐠𝐨𝐞𝐬 𝐛𝐞 𝐢𝐝𝐞𝐧𝐭𝐢𝐜𝐚𝐥

Maths-General
General
Maths-

L t subscript left parenthesis x rightwards arrow 0 right parenthesis invisible function application left parenthesis ∛ left parenthesis 1 plus x right parenthesis minus ∛ left parenthesis 1 minus x right parenthesis right parenthesis divided by x equals

L t subscript left parenthesis x rightwards arrow 0 right parenthesis invisible function application left parenthesis ∛ left parenthesis 1 plus x right parenthesis minus ∛ left parenthesis 1 minus x right parenthesis right parenthesis divided by x equals

Maths-General
General
Maths-

A non zero vector stack a with ‾ on top is parallel to the line of intersection of the plane determined by the vectors i with ‾ on top comma i with ‾ on top plus j with ‾ on top and the plane determined by the vectors i with ‾ on top minus j with ‾ on top comma i with ‾ on top plus k with ‾ on top then the angle between stack a with ‾ on top and left parenthesis i with ‾ on top minus 2 j with ‾ on top plus 2 k with ‾ on top right parenthesis is horizontal ellipsis..

For such questions, we should know how to find the normal to the plane. We should know how to find the line of intersection of two planes. And, we should know how to take a cross product.

A non zero vector stack a with ‾ on top is parallel to the line of intersection of the plane determined by the vectors i with ‾ on top comma i with ‾ on top plus j with ‾ on top and the plane determined by the vectors i with ‾ on top minus j with ‾ on top comma i with ‾ on top plus k with ‾ on top then the angle between stack a with ‾ on top and left parenthesis i with ‾ on top minus 2 j with ‾ on top plus 2 k with ‾ on top right parenthesis is horizontal ellipsis..

Maths-General

For such questions, we should know how to find the normal to the plane. We should know how to find the line of intersection of two planes. And, we should know how to take a cross product.

parallel
General
Maths-

Let a with minus on top equals i with minus on top plus j with minus on top plus k with minus on top comma b with minus on top equals negative i plus j with minus on top plus k with minus on top comma c with minus on top equals i minus j with minus on top plus k with minus on top and d with minus on top equals i plus j with minus on top minus k with minus on top. Then, the line of intersection of planes one determined by stack a with ‾ on top comma stack b with ‾ on top and other determined by stack c with ‾ on top comma stack d with ‾ on top is perpendicular to

For such questions, we should know how to find the line intersecting two planes. We should also know how to find the normal to the plane using two vectors.

Let a with minus on top equals i with minus on top plus j with minus on top plus k with minus on top comma b with minus on top equals negative i plus j with minus on top plus k with minus on top comma c with minus on top equals i minus j with minus on top plus k with minus on top and d with minus on top equals i plus j with minus on top minus k with minus on top. Then, the line of intersection of planes one determined by stack a with ‾ on top comma stack b with ‾ on top and other determined by stack c with ‾ on top comma stack d with ‾ on top is perpendicular to

Maths-General

For such questions, we should know how to find the line intersecting two planes. We should also know how to find the normal to the plane using two vectors.

General
Maths-

𝐀 𝐠𝐮𝐚𝐫𝐝 𝐨𝐟 𝟏𝟐 𝐦𝐞𝐧 𝐢𝐬 𝐟𝐨𝐫𝐦𝐞𝐝 𝐟𝐫𝐨𝐦 𝐧 𝐬𝐨𝐥𝐝𝐢𝐞𝐫𝐬.𝐈𝐟 𝐀 𝐚𝐧𝐝 𝐁 𝐚𝐫𝐞 𝐭𝐡𝐫𝐞𝐞 𝐭𝐢𝐦𝐞𝐬 𝐚𝐬 𝐨𝐟𝐭𝐞𝐧 𝐭𝐨𝐠𝐞𝐭𝐡𝐞𝐫 𝐨𝐧 𝐠𝐮𝐚𝐫𝐝 𝐚𝐬 𝐂, 𝐃, 𝐄 𝐭𝐡𝐞𝐧 𝐧 =

𝐀 𝐠𝐮𝐚𝐫𝐝 𝐨𝐟 𝟏𝟐 𝐦𝐞𝐧 𝐢𝐬 𝐟𝐨𝐫𝐦𝐞𝐝 𝐟𝐫𝐨𝐦 𝐧 𝐬𝐨𝐥𝐝𝐢𝐞𝐫𝐬.𝐈𝐟 𝐀 𝐚𝐧𝐝 𝐁 𝐚𝐫𝐞 𝐭𝐡𝐫𝐞𝐞 𝐭𝐢𝐦𝐞𝐬 𝐚𝐬 𝐨𝐟𝐭𝐞𝐧 𝐭𝐨𝐠𝐞𝐭𝐡𝐞𝐫 𝐨𝐧 𝐠𝐮𝐚𝐫𝐝 𝐚𝐬 𝐂, 𝐃, 𝐄 𝐭𝐡𝐞𝐧 𝐧 =

Maths-General
General
Maths-

Number of ways of selecting 3 consecutive objects out of 15 objects (distinct) placed around a circle is

Number of ways of selecting 3 consecutive objects out of 15 objects (distinct) placed around a circle is

Maths-General
parallel
General
Maths-

If f left parenthesis x right parenthesis equals negative √ left parenthesis 25 minus x squared right parenthesis, then L t subscript left parenthesis x rightwards arrow 1 right parenthesis left parenthesis f left parenthesis x right parenthesis minus f left parenthesis 1 right parenthesis right parenthesis divided by left parenthesis x minus 1 right parenthesis equals

If f left parenthesis x right parenthesis equals negative √ left parenthesis 25 minus x squared right parenthesis, then L t subscript left parenthesis x rightwards arrow 1 right parenthesis left parenthesis f left parenthesis x right parenthesis minus f left parenthesis 1 right parenthesis right parenthesis divided by left parenthesis x minus 1 right parenthesis equals

Maths-General
General
Maths-

L t subscript left parenthesis x rightwards arrow 2 right parenthesis left parenthesis √ left parenthesis 1 minus c o s invisible function application left curly bracket 2 left parenthesis x minus 2 right parenthesis factorial right parenthesis divided by left parenthesis x minus 2 right parenthesis right parenthesis equals

L t subscript left parenthesis x rightwards arrow 2 right parenthesis left parenthesis √ left parenthesis 1 minus c o s invisible function application left curly bracket 2 left parenthesis x minus 2 right parenthesis factorial right parenthesis divided by left parenthesis x minus 2 right parenthesis right parenthesis equals

Maths-General
General
Maths-

The number of ways in which 6 gentlemen and 3 ladies be seated round a table so that every gentleman may have a lady by his side is

The number of ways in which 6 gentlemen and 3 ladies be seated round a table so that every gentleman may have a lady by his side is

Maths-General
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