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Maths-

General

Easy

Question

Write recursive formula and find the first term. $a subscript n equals 108 minus n$

hint Hint:

Recursive Formula is a formula that defines the each term of sequence using the previous/preceding terms.

The correct answer is: a_(n-1)=a_n+1.

Explanation:

We have given a explicit function $a subscript n equals 108 minus n$ .

We have to find the recursive formula and first term.

Step 1 of 2:
We have given explicit formula $a subscript n equals 108 minus n$ .
First term will be
$table attributes columnalign right left right left right left right left right left right left columnspacing 0em 2em 0em 2em 0em 2em 0em 2em 0em 2em 0em end attributes row cell a subscript n equals 108 minus n end cell row cell a subscript 1 equals 108 minus left parenthesis 1 right parenthesis end cell row cell a subscript 1 equals 107 end cell end table$
Step 2 of 2:
Now for recursive formula we will calculate a_n-1.
So,
$table attributes columnalign right left right left right left right left right left right left columnspacing 0em 2em 0em 2em 0em 2em 0em 2em 0em 2em 0em end attributes row cell a subscript n minus 1 end subscript equals 108 minus left parenthesis n minus 1 right parenthesis end cell row cell a subscript n minus 1 end subscript equals 108 minus n plus 1 end cell row cell a subscript n minus 1 end subscript equals a subscript n plus 1 end cell end table$
.

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