Math, asked by Anonymous, 1 year ago

find the sum of 1+5+3+9+13+7+...........up to 20terms .

Answers

Answered by abhaumik

1

AP=1+3+5+7+9+11+13…20terms
a=1
d=2
n=20
sum=20/2(2×1+(20-1)2)
=10(2+38)
=10×40
=400
Hope it helps.

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