Q. 94.2( 9 Votes )

Find the sum to first n terms of an A.P. whose kth term is 5k + 1.

Answer :

As it is given that kth term of the AP = 5k + 1


ak = a + (k – 1)d


5k + 1 = a + (k – 1)d


5k + 1 = a + kd – d


Now, on comparing the coefficient of k, we get


d = 5


and a – d = 1


a – 5 = 1


a = 6


We know that,






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