If for an A.P t25=99 find s49
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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.
finally itz your answer.
it will surely help uh.
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