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Question

Find the cardinal number of the following sets:
A2={x:xNand3x<7}

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Solution

Step : Find the cardinal number of the given set
Given: A2={x:xNand3x<7}

As, 3x<7,xN

x=3,4,5,6

A2={3,4,5,6}

Number of elements in set A2 = 4

We know that the number of distinct element in a finite set is called its cardinal number.

Hence, the cardinal number of set A2 is 4.

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