Problem
NT-B1-M12-P001 Set 1. Parity of a Product
#1
★☆☆☆☆ Level 1 of 5
Prove that \(n^2+n\) is even for every integer \(n\).
Factor out \(n\).
\(n^2+n=n(n+1)\). Of two consecutive integers, one is even, so the product is even.
Technical start of the mock module.