Math, asked by aru03, 1 year ago

the first and last term of an Ap are 17 and 350 respectively. if c.d is 9 how many terms are there and what is their sums.

Answers

Answered by Anonymous
8
hope it helps you:-)
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Answered by VikasVerma11
6
a= 17

an= 350. d= 9


an = a +(n-1)d

350=17+(n-1)9

350-17=(n-1)9

333
—— =(n-1)
9

37+1 =n

38=n


Sn= n\2 (a+l)

=38\2(17 + 350)

=19 x 367

=6973
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