Test Index

Sets, Relations and Functions

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Question : 9 of 65

Marks: +1, -0

If

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

B = \{1,3,6,10,15\}

then cardinal number of

A - B

is

3
-4
6
None

Solution:

Concept:

A - B

means elements present in

A

but not in

B

. Its cardinal number is the count of such elements.

Explanation:

Given

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

and

B = \{1,3,6,10,15\}

.

Common elements are

1

and

3

.

Removing these from

A

, we get

A - B = \{2,5,7\}

.

Number of elements in

A - B

is

3

.

Answer:

3

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