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Find the sum to n terms of the A.P,whose kth term is 5k+1.
 It is given that the kth term of the A.P. is 5k + 1.

kth term = ak = a + (k – 1)d

∴ a + (k – 1)d = 5k + 1

a + kd – d = 5k + 1

Comparing the coefficient of k, we obtain d = 5

a – d = 1

⇒ a – 5 = 1

⇒ a = 6


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