Math, asked by ri8thasvitsama, 1 year ago

In an A.P. , if a = 1, an= 20 and sn =399, then n is?

Answers

Answered by srushti2

7

u can solve this in different manners and these is the one way.

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Answered by adeeladilu2

3

ur answer is attached above.....

stay safe ND have a nice day.......

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