Question

Which of the following is an irrational number

Answer 1

?

Answer 2

C

Answer 3

According to the definition given by Google, an irrational number is: "In mathematics, an irrational number is any real number that cannot be expressed as a ratio of integers. Informally, this means that an irrational number cannot be represented as a simple fraction. Irrational numbers are those real numbers that cannot be represented as terminating or repeating decimals.

Answer 4

The square root of 169 is 13. The square root of 12 squared is just 12. The 0.78 is a repeating decimal, so the only one that is irrational is the square root of 18.