Question

4^n + 1 , Where n is a natural number , will

A) definitely be an odd no.

B) definitely be an even no.

C) definitely be a multiple of 5

D) be odd if n is odd and be even if n is even

Answer 1

a) will definitely be an odd number

Explanation:

4^n is always even (when you multiply even and even number, the product is always even)

when you add one to even number, the sum is always odd

so 4^n +1 is odd.