(-1)1+ (-1 )2+ ... + (-1)2020?

Answers (1)

Let a odd number number be x and an even number be y
(-1)^x=-1 and (-1)^y=1
(-1)^1+(-1)^2+(-1)^3+(-2)^4........+(-1)^2019+(-1)^^2020
(-1) + 1 + (-1) + 1....+(-1) +1
-1+1-1+1...-1+1
Rightarrow 0
 

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