Math, asked by tony99, 1 year ago

find the sum of natural numbers between 20 and 100

Answers

Answered by goyalvikas78

Hey there!

num of terms=80
1st term=20
common difference=1
Sn= n/2(2a+(n-1)d)
Sn= 80/2(40+79 . 1)
Sn= 80/2(119)
Sn= 40(119) = 4760

Hope it help

goyalvikas78: pls mark as brainliest

tony99: how u got common difference 1

goyalvikas78: a1 = 20 and a2 = 21 so common difference = a2 - a1 => 21-20 =>1

goyalvikas78: > is >

goyalvikas78: sorry & gt; is actually the arrow sign

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