Question

the first term and last term of an AP series are 5 and 175 respectively. if the sum of the series are 3145. find the number of terms and common difference of the series​

Answer 1

Answer:

here is that answer buddy

let first term is a =5

and last term is a+(n-1)d =5+(n-1)d=175

(n-1)d=170 ------>>>1

then

Sn is =n/2×{2a+(n-1)d}

3145=n/2(10+170)

6290=180×n

n=35

then

d=5

ok

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