Q. 215.0( 2 Votes )

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

Answer :

Tk = 5k + 1

T1 = 5 × 1 + 1 = 6

T2 = 5 × 2 + 1 = 11

T3 = 5 × 3 + 1 = 16

T4 = 5 × 4 + 1 = 21

Now a = 6, d = 11 – 6 = 5

Thus Sn =

=

=

= =

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