Question

The nth term Of a sequence is (2n-3)find it's fifteen term

Answer 1

just put 15 in the place of n.
and I'll get ur answer

Answer 2

This is a perfect answer....

Given nth term of AP an = 3 - 2n

Put n = 1, we get

a1 = 3 - 2 = 1

Put n = 2, we get a2 = 3 - 4 = - 1

Hence d = -1 - 1 = -2

a15 = 3- 30 =  - 27

Sum of 15 terms = (15/2)[1 + (-27)]

= (15/2) × - 26 = -195

Hope it helps you....