Q. 185.0( 1 Vote )

If the nthterm of an A.P. is tn = 3-5n, then the sum of the first n terms is
A.

B. n(1 - 5n)

C.

D.

Answer :

Given tn = 3-5n, t1 = 3-5 = -2


Sum of n terms of an AP = Sn = a + tn)


Sn = -2 + 3-5n) = 1-5n)


So the correct answer is B.

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