Math, asked by krishnagaikwad5082, 11 months ago

The first term of an A.P. is 1 and the n th term is 20 . if Sn=399, then n=......

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Answered by da4729204

0

Answer:n = 38

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Answered by adeeladilu2

3

ur answer is attached above....

.

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

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