Question

what is the middle term 6,13,20,...........216?

Answer 1

111 is the correct answer

Answer 2

a = 6
d = 13 - 6 = 7

6 + 7(n - 1) = 216
7(n - 1) = 210
n - 1 = 30
n = 31

middle term = (31 + 1)/2 = 16th term

16th term
= 6 + 7(16 - 1)
= 6 + 7 * 15
= 6 + 105
= 111
therefore middle term=111