Question

How do you find `a_13` for the arithmetic sequence -17, -12, -7, ...?

Answer 1

`T_13 = 43`

Explanation:

The general term of an A.P. is given by

`T_n = a_1 + (n-1)d" "larr` we have `n=13, a_1 = -17, d = 5`

`T_13 = -17 + (12) xx 5`

`T_13 = -17 +60`

`T_13 = 43`