Question

find middle term of ap 5,10 ,15 ............405

Answer 1

Here,
a is 5
d = 10 - 5 = 5.

Also, nth term = 405...

So, 5 + (n-1)5 = 405

Hence, n is 81...

So, middle term is 81 + 1/2 = 41...

Middle term = 41st term
= 5 + (41-1)5

= 205.....

Answer 2

answer this question is 205