Question

The sum of the first 'n' terms of an A.P. whose first term is 8 and the last term is 62,is 700 Therefore
the A.P. consists of terms how many term s?
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Answer 1

Step-by-step explanation:

a=8---------------------------------(1)

a+(n-1)d=62

=> 8+(n-1)d=62 (from(1))

=> (n-1)d=54---------------------(2)

also n/2(a+l)=700

=> n/2(8+62)=700

=> n(70)=1400

=> n=20

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Answer 2

Answer:

n=20

Step-by-step explanation:

n/2(a+l)=700

n/2(8+62)=700

n(70)=(2×700)

n=1400/70

n=20