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Question

If the sum of n terms of an A.P. is given by Sn=a+bn+cn2, where a,b,c are independent of n, then which of the following is (are) CORRECT?

A
a=0
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B
Common difference of the A.P. must be 2b
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C
Common difference of the A.P. must be 2c
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D
First term of the A.P. is b+c
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