Q. 75.0( 1 Vote )

# If a1, a2 , a3,...are in A.P. such that , then the 13th term of the A.P. isA. B. 0C. 12a1D. 14a1

Given

Let common ratio be d

a4 = a1 + 3d

a7 = a1 + 6d

2a1 + 6d = 3a1 + 18d

a1 + 12d = 0

Which corresponds to the 13th term (a1 + (13-1)d) = 0

Therefore, the correct option is B.

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