Question

plz solve this for me ....

Answer 1

hope its help you.......

Answer 2

Let 'a' be the first term & 'd' be the common difference of an A.P

[a (n)th = a+ (n-1)d]

15th term of an a.p
a(15) = a+14d

8th term of an a.p
a8 = a+7d

A.T.Q

a15= a8 + 7

a+14d = a+7d+7

14d-7d= 7

7d= 7

d= 7/7

d=1
common difference (d) = 1