Question

If the sum of first 6th term is 12 and sum of first 10th term is 60 then field the sum of its n term

Answer 1

Explanation:

Given that:

S6=12

S10=60

s6=6/2(a+l)

S10=10/2(a+l)

12=3(a+l) (1)

60=5(a+l) (2)

then, Sn= n/2(a+l)

Sn= an/2+ln/2

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