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If S1, S2 and S3 are the sum of n, 2n an...

If `S_1, S_2 and S_3` are the sum of n, 2n and 3n terms of an Arithmetic Progression (A.P.) then which one of the following is true :

A

`S_3 = S_2 + S_1`

B

`S_3 = 3(S_2 - S_1)`

C

`S_3 = 2(S_2 - S_1)`

D

`S_3 = 4(S_1 - S_2)`

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