Question

in an ap of 50 terms,the sum of 1st 10 terms

Answer 1

In an ap of 50 terms, the sum of 1st 10 terms is 210 and the sum of its last 15 terms is 2565. find the a.p.Consider a and d as the first term and the common difference of an A.P.respectively. Given that the sum of thefirst 10 terms is 210.

Answer 2

use formula
s=n/2(2a+(n-1)d)
n=10
ais first term
n is no of term
d I'd difference