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Let S1 be the sum of first 2n terms of a...

Let `S_1` be the sum of first 2n terms of an arithmetic progression. Let `S_2` be the sum first 4n terms of the same arithmeti progression. If `(S_(2)-S_(1))` is 1000, then the sum of the first 6n term of the arithmetic progression is equal to :

A

3000

B

5000

C

1000

D

7000

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