Question

Which one of the following is the correct representation for the set {x: x is a positive integer and x^3<50} in roster form?

(a) {0,1,2,3,4,5}

(b) {-1,1,2,3}

(c) {1,2,3}

(d) {0,1,2,3}

The question was posed to me during an online interview.

The above asked question is from Sets and their Representations in chapter Sets of Mathematics – Class 11

Answer 1

Right answer is (c) {1,2,3}

Easiest explanation: 0 is not a positive integer moreover

3^3<50 and 4^3>50