2+3+4+5+6+7 formula?

A

AntPask2017-12-27 21:11:29

Mathematics

AntPask, 2017-12-27 21:11:29

Greetings. How to add
1+2+3+4+5 ... 100
1+2+3...1000 etc. without adding each number
thanks

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3 answer(s)

A

Andrey Burov, 2017-12-27
@AntPask

https://en.wikihow.com/%D1%81%D0%BB%D0%BE%D0%B6%D0...

L

longclaps, 2017-12-27
@longclaps

Arithmetic progression, school, grade 9.

D

Dimonchik, 2017-12-27
@dimonchik2013

n(n+1)/2
series theory, second year

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