Question

The third and 7th of an AP are 27and the 91 representatively find first term and the common difference

Answer 1

Step-by-step explanation:

Given:

19=a+5d

41=a+16d

Tn =a+(n−1)d

Where a is the first term, d is the common difference and Tn denotes the n-th term of an AP.

Solving the above equations gives: d=2,a=9

Therefore,

T40 =9+39⋅2= 87

solution=87