Question

Write the following sets in Set - Builder form
(i) The set of all positive even numbers
(ii) The set of all whole numbers less than 20
(iii) The set of all positive integers which are multiples of 3
(iv) The set of all odd natural numbers less than 15
(v) The set of all letters in the word 'computer'

Answer 1

(i) { $x:x$ is a positive even number }
(ii) { $x:x$ is a whole number and $x<20$ }
(iii) { $x:x$ is a positive integer and multiple of 3 }
(iv) { $x:x$ is an odd natural number and $x<15$ }
(v) { $x:x$ is a letter in the word 'computer' }