Math, asked by vikabhy, 1 year ago

Find the sum of the first 18 terms of the AP. 9, 7, 5, 3

Answers

Answered by karishma4454

2

a=9

d=7-9

=-2

S18=n/2(2a+(n-1)d

=18/2(2×9+(18-1)×-2

=9(18+(-34)

=9×(-16)

=-144

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