1.

The first and the last terms of an A.P are 8 and 350 respectively.if its common difference is 9 ,how many terms are there and what is their sum

Answer»

Formula of N= a+(n-1)d

350=8+(n-1)9

350=8+9n-9

9n=351

n=39

now sum=n/2(a+l)

39/2(8+350)

39/2×358=39×179=6981

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