Math, asked by vijay2960, 1 year ago

Find the sum of natural number from 20 to 100

Answers

Answered by rohan232

0

hey..

no of term = 80 1st term(a)=20
common difference=1

wkt

Sn= n/2(2a+(n-1)
Sn= 80/2(40+79 . 1)
Sn= 80/2(119)
Sn= 40(119) = 4760

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