Question

{x : x is a multiple of 3 and x < 21} set roster form

Answer 1

{x : x is a multiple of 3 and x < 21} set roster form

=> { 3, 6, 9, 12, 15, 18 }

Answer 2

SOLUTION

TO DETERMINE

Set in roster form

{ x : x is a multiple of 3 and x < 21 }

CONCEPT TO BE IMPLEMENTED

SET :

A set is a well defined collection of distinct objects of our perception or of our thought to be conceived as a whole

Representation of Set :

A set can be represented in following ways

(i) Statement form method

(ii) Roster or tabular form method

(iii) Rule or set builder form method

EVALUATION

Let S be the given set

Then

S = { x : x is a multiple of 3 and x < 21 }

Now the multiples of 3 less than 21 are 3, 6, 9, 12, 15, 18

Hence the required set in roster form is

S = { 3, 6, 9, 12, 15, 18 }

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