Given,
All odd number has an odd cube.
Odd numbers = 2n+1.
{2n+1: n ∈ Z, n>0}
∴ The set of all positive integers whose cube is odd = {1,3,5,7,……}
Given,
All odd number has an odd cube.
Odd numbers = 2n+1.
{2n+1: n ∈ Z, n>0}
∴ The set of all positive integers whose cube is odd = {1,3,5,7,……}