Math, asked by AShiba9293, 5 months ago

The sum of first 10 terms of the A.P. 20,15,10,...

Answers

Answered by KAUSHLESH385

0

Answer:

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

SUM=5(40+(9)-5)

SUM=5(40-45)

SUM=5 x -5

SUM=-25

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