Question

10.3n is an odd number, which of the following represents an even
number?​

Answer 1

2n and n + 1 are even if n is odd.

20 * (10.3)*n is even if (10.3)n is odd.

Explanation:

Are you talking about the expression 10.3n or simply n ?

If n is an odd number then n+1 is even

2*n is even