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The sum of first n terms of a series is ...

The sum of first n terms of a series is `3^(n)(a+b)` when a, b are constants. Then the terms of the series are in

A

A.P.

B

G.P.

C

A.P. from the second term onwards

D

G.P. from the second term onwards

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WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2007-MULTIPLE CHOICE QUESTIONS
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