Question

11. If 'a' and 'b' are two prime numbers, then ab is an irrational or not? justify your
answer with two examples.​

Answer 1

If 'a' and 'b' are two prime numbers, then ab is a rational number

example 1:

let a= 2 and b = 3

ab = 2×3 =6

here 6 is a rational number

example 2:

let a =5 and b =7

ab = 5×7 =35

here 35 is a rational number

therefore from examples 1 and 2 we can justify that If 'a' and 'b' are two prime numbers, then ab is not an irrational in other words it is a rational number.