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Let a1 , a2 ,a3, …., an be an A.P. and S...

Let `a_1 , a_2 ,a_3, …., a_n` be an A.P. and `S_1 , S_2 and S_3` be the sum of first n , 2n and 3n terms respectively then `S_3 - S_2 -S_1` is equal to , if a is first term and d is common difference :

A

3a-2n-d

B

a(n+2d)

C

3a+2nd

D

`2n^2d`

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The correct Answer is:
D
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