Math, asked by puvitha83, 1 year ago

find the sum of first 22 terms of an AP in which D=7 and 22nd term is 149

Answers

Answered by ishwarsinghdhaliwal

98

Hope it helps ...................

Attachments:

Answered by sabip397

14

Answer:

22n term=149

d=7

a+21d=149

a+21(7)=149

a+147=149

a=149-147

a=2

S=n/2(2a+(n-1)d)

=22/2(4+(22+1)7

=11(4+21×7)

=11(4+147)

=11×151

S=1661

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