1.

Find the 15th term of AP with second term 11 and common difference 9

Answer»

Heya Kiddo !!

==> Let a be the first TERM and d be the common difference

Given : a2 = 11 and common difference d = 9

==> a2 = a + d

by substituting the value of d and a2 in above EQUATION we have,

11 = a + 9

==> a = 11 - 9

==> a = 2

Now,

15th term is given by

a15 = a + 14D

on substituting both a and d in above equation we get,

==> a15 = 2 + 14 X 9

==> 2 + 126

==> a15 = 128

Hope it helps you ❤❤❤



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