$Y$ is the set of positive integers that are multiples of $3$ and less than $20$. Write down a

Question

$Y$ is the set of positive integers that are multiples of $3$ and less than $20$. Write down all the elements of the set $Y$. Find the value of $n(Y)$.

Accepted Answer

(a) $Y=\{3,6,9,12,15,18\}$. (b) $n(Y)=6$.

Methods of Defining Sets: Roster Form and Descriptive Notation

Methods of Defining Sets: Roster Form and Descriptive Notation

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