Question

prove that nsquare +n is even, where n is natural number ​

Answer 1

let's take 3 numbers

3,4,5

now

for n=3

n^2+n. = 9+3=12

for n= 4

= 16+4= 20

for n=5

= 25+5=30

in every case the answer is even

so we can prove it

Answer 2

n2+n= n(n+1)

It's product of two consecutive integers and then one of them exactly must be even and thus there product will be even.

hope you get it ❤❤