Math, asked by tanu77735, 4 months ago

find the sum of first 15 terms of the A.P 9,7,5,3....

Answers

Answered by chemistrywala

0

a15 = a+14d = 9+14(-2) == 9-28 = -19

S15 = 15/2 (9-19) == 15/2 × -10 = -75

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