Q. 34.0( 13 Votes )

# If the sum of n terms of an A.P. be 3n^{2} + n and its common difference is 6, then its first term is

A. 2

B. 3

C. 1

D. 4

Answer :

Here, S_{n}= 3n^{2} + n

d = 6

Putting n= 1

S_{1} = 3 + 1 = 4

Sum of first 1 term = first term = 4

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