Question

If n is an even number,all of the following must also be even except

Answer 1

`(a)\ n+1`

Explanation:

Given

`n \to even`

Required

Which cannot be even

To do this, we assume an even number for n;

Assume that
`n = 4`

So, we have:

`(a)\ n+1`

`n +1 = 4 + 1 = 5` --- this is odd

`(b)\ n+2`

`n +2 = 4+2 = 6` ---- this is even

`(c)\ 2n`

`2n = 2 * 4 = 8` --- this is even

`(d)\ n^2`

`n^2 = 4^2 = 16` --- this is even

Hence, (a) can't be even