The third term of an A.P is 10times more than the second term. Find the sum of the eight and fifteen term of the A.P if the seventh term is seven times the first term

Answer 1

a+2d = 10(a+d)
a+6d = 7a

Solve for a and d, and then you can find the sum of

T8+T15 = (a+7d)+(a+14d)

Answer 2

If the second term of an arithmetic sequence is -2 and the fourth term is 6, find the seventh term.

Answer 3

The third term of an ap is 18 and seveententh term is 30 find the sum of 17 term