Question

Vijay invests some amount in the National Saving Certificates. For the 1^st year, he invests Rs. 500, for the 2^nd year he invests Rs. 700, for the 3^rd year he invests Rs. 900, and so on. How much amount he has invested in 12 years?

Answer 1

Amount of investments year-wise are as follows:

500, 700, 900, ...

This sequence is an A.P. with

a = 500, d = 200, n = 12

\(\therefore\) Total amount invested in 12 years is Rs.19200.