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If the sum of n terms of an A.P. is give...

If the sum of `n` terms of an A.P. is given by `S_n=a+b n+c n^2, w h e r ea ,b ,c` are independent of `n ,t h e n` `a=0` common difference of A.P. must be `2b` common difference of A.P. must be `2c` first term of A.P. is `b+c`

A

`a ne 0`

B

`d ne 3b`

C

d = 2c

D

first term of an AP is b-c

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The correct Answer is:
C
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