Question

Explain why n (n - 1) must be an even number.

Answer 1

Step-by-step explanation:

Case 1: If we take n be a even number then (n-1) will be a odd number.

We know even number when multiplied with an odd number it gives an even number.

Case 2: If we take n be a odd number then (n-1) will be a even number.

We know even number when multiplied with an odd number it gives an even number.

So when any n multiplied with (n-1), it will give an even number.