Question

Find, if the following sets are singleton sets:

A = {x : 7x – 3 = 11}

Answer 1

A = {x : 7x – 3 = 11}

7x -3 = 11

⇒ 7x = 11 + 3

⇒ 7x = 14

⇒ x = `(14)/(7)` = 2

∴ A = {2}

Hence given set A is a singleton set.