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The sum of n, 2n, 3n terms of an A.P. ar...

The sum of n, 2n, 3n terms of an A.P. are `S_(1), S_(2), S_(3)`, respectively. Then `3(S_(n)-S_(1))=`

A

`2S_(3)`

B

`S_(3)//2`

C

`3S_(3)`

D

`S_(3)`

Text Solution

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The correct Answer is:
D
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