If S(n) denotes the sum of first n terms...

If `S_(n)` denotes the sum of first n terms of an A.P., then
`(S_(3n)-S_(n-1))/(S_(2n)-S_(n-1))` is equal to

A

`S_(n)-S_(n-1)`

B

nd

C

0

D

`S_(3n)-S_(n)`

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