Question

The first term of an A,P is 5 ,the last term is 35,and the sum is 140.find the number of term in the series and the common difference ?

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

Sn=n/2(a+l).

140=n/2(5+35)

140=n/2(40)

n=(140*2)÷40

1. n=7.

T7 =35

a+6d=35

5+6d=35

d=(30/6)=5.

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