Question

If for an A.P t25=99 find s49

Answer 1

Answer:

a+24d=99

so a=99-24d............1

Now,

s49=49/2(2a+(49-1)d)

=49/2(2*(99-24d)+48d)

=49/2(198-48d+48d)

=49/2(198)

=49/2*198

=49*99

=4851.

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