Math, asked by shivabnagally9911, 1 year ago

The first term amd last term of an A.P. are 500 and 1000 respectively. Find the sum of 20 terms.

Answers

Answered by ArjumandAshraf

5

s20=n÷2 (500+1000 )
=10×1500
=15000

Answered by Mathemetician

1

Sñ= n/2*(a+an)
= 10*1500
=15000

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