Vinay Sharma and H K Thakur Solutions for Chapter: Playing With Numbers, Exercise 1: SELF PRACTICE 3.1

Every natural number is either prime or composite.

The product of two odd numbers is always an odd number.

$31$ is a factor of $20$.

$1$ is a factor of every natural number.

Both $3$ and $9$ are factors of $15$.

$1$ is a prime number.

$2$ is the only even prime number.

$9$ is the smallest odd composite number.