Question

5. Find the sum of 5th terms of the series
1/5, 1/2, 5/4, .......
(a) 12.11
(b) 12.24
(c) 12.88
(d) 12.92​

Answer 1

Answer:

ANSWER

Given series is 1,3,5,.....

We know, sum =2n[2a+(n−1)d]

Therefore, sum to 15 terms of 1,3,5,.... is 

S15=215[2(1)+14(2)]

=215(2+28)

=15[15]

∴ Sum =225