Question

Which number is IRRATIONAL?

A)
49
B)
64
C)
72
D)
121

Answer 1

Answer:

none of these numbers are irrational

however if you are asking if the roots of these numbers are irrational

$\sqrt{72} \: is \: irrational$

Answer 2

√49 = 7

√64 = 8

√72 = 8.48

√121 = 11

As √72 value is in decimal, it is irrational

Therefore, √72 is irrational.

Option "C" is the right answer

Hope this will help you