Maths-
General
Easy

Question

Statement-I : If x2y3 = 6(x, y > 0), then the least value of 3x + 4y is 10
Statement-II : If m1, m2 element of N, a1, a2 > 0 then fraction numerator m subscript 1 a subscript 1 plus m subscript 2 a subscript 2 over denominator m subscript 1 plus m subscript 2 end fraction greater or equal than open parentheses a subscript 1 superscript m subscript 1 end superscript a subscript 2 superscript m subscript 2 end superscript close parentheses to the power of fraction numerator 1 over denominator m subscript 1 plus m subscript 2 end fraction end exponent and equality holds when a1 = a2.

  1. Statement-I is true, Statement-II is true ; Statement-II is correct explanation for Statement-I.    
  2. Statement-I is true, Statement-II is true ; Statement-II is NOT a correct explanation for statement-I.    
  3. Statement-I is true, Statement-II is false.    
  4. Statement-I is false, Statement-II is true.    

hintHint:

apply the AM GM rule

The correct answer is: Statement-I is true, Statement-II is true ; Statement-II is correct explanation for Statement-I.



    Statement-I is true, Statement-II is true ; Statement-II is correct explanation for Statement-I.
    If we break 3x into two parts 3x/2 ,3x/2 and 4y into three parts 4y/3 ,4y/3,4y/3  and then apply the AM>=GM rule, we get
    (3x/2+3x/2+ 4y/3+4y/3+4y/3)/5>=((3x/2)2(4y/3)3)1/5
    y3= 6/x2
    we get
    (3x+4y)/5>= 2
    3x+4y>=10
    Statement 1 is true.

    Let there be a1,a1,a1….m1 times ,a2,a2,a2….m2 times.
    Applying the AM>=GM rule, we get the Statement 2. Hence, both are true.

    the AM GM rule is valid for any set of natural numbers, i.e., numbers > 0.

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