Which of these is not a rational number 9 10 1 4?

Answer 1

Out of the numbers,

9, 10, 1, and 4,

no number is irrational.

Each of these numbers can be written in the form p/q (p,q = Z ; q not equal to 0).

9 = 9/1, 10 = 10/1, 1 = 1/1 and 4 = 4/1

So, all these numbers are rational. and none of these numbers is 'not a rational number'.