Question

Which of the following numbers is not an irrational number?

(a) π

(b) \(\frac {22}{7}\)

(c) 1.5353353335….

(d) 2.7878878887….

This question was posed to me in exam.

My question is based upon Irrational and Rational Numbers in portion Real Numbers of Mathematics – Class 10

Answer 1

The correct option is (b) \(\frac {22}{7}\)

For explanation: An irrational number is expressible in the decimal form as non-terminating and non-repeating decimals.

From the given options,

π, 1.5353353335…, 2.7878878887… are non-terminating and non-repeating decimal.

Whereas, \(\frac {22}{7}\) is non-terminating but repeating decimal.