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Let Sn denote the sum of first n terms o...

Let `S_n` denote the sum of first n terms of an AP and `3S_n=S_(2n)` What is `S_(3n):S_n` equal to? What is `S_(3n):S_(2n)` equal to?

A

`2:1`

B

`3:1`

C

`4:1`

D

`5:1`

Text Solution

Verified by Experts

The correct Answer is:
A
From explanation `(S_(3n))/(S_(n))=(6n^(2)d)/(3n^(2)d)=(2)/(1)=2:1`
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