find the sum to n terms of an ap whose kth term is 5k + 1
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AP is 6,11,16........5n+1
here a=6 and d=5
so sum is n/2(2*6+(n-1)5)
you will get (7n+5n^2)/2
here a=6 and d=5
so sum is n/2(2*6+(n-1)5)
you will get (7n+5n^2)/2
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