Question

If the sum of a certain number of terms of the A.P 25,22,19...is 116,then find the last term.

Answer 1

Answer:

a=25 and d=22-25=-3

n=116

an=a+(n-1)d

an=25+(116-1)×-3

an=25+(115)×-3

an=25-345

an=-320

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