# <span lang="EN-US

We know that in roster method, we write all the elements of a set in curly brackets. Each of the element is written only once and separated by commas. The order of the element is not important but it is necessary to write all the elements of the set.

(i) A = {x: x is a natural number greater than 50 but smaller than 100}

Natural numbers greater than 50 are 51, 52, 53… and smaller than 100 are … 97, 98, 99.

A = {51, 52, 53 … 97, 98, 99}

(ii) B = {x: x is an integer, x2 = 4}

Given x2 = 4

x = √4

x = ±2

B = {+2, -2}

(iii) D = {x : x is a letter in the word “LOYAL”}

D = {L, O, Y, A}

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