Question

22. Prove that n^2-n is divisible by 2 for every positive
integer n.​

Answer 1

Answer:

n^2-n=(n-1)(n)

if n is odd then n-1 is even

odd×even=even

if n is even then n-1=odd

even ×odd=even

every even is divisible by 2

thank8

Answer 2

Answer:

Hence prooved

Step-by-step explanation:

see the attachment

Thank you