Test Index

Sets, Relations and Functions

Question : 50 of 65

Marks: +1, -0

A=\{1,2,3,4,5,6,7\}

B=\{2,4,6\}

Cardinal number of AUB

Solution:

Concept:

The union of two sets contains all elements that are in either set. The cardinal number is the number of distinct elements.

Explanation:

A = \{1,2,3,4,5,6,7\}

and

B = \{2,4,6\}

Since every element of

B

is already in

A

A \cup B = A = \{1,2,3,4,5,6,7\}

Counting the elements gives

7

Answer:

The cardinal number of

A\cup B

7

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