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Question

If f : A B is a bijective function and if n(B) = 7, then n(A) is equal to

A
7
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B
49
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C
1
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D
14
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Solution

The correct option is A 7
Bijective Function: If the function 'f' is both one-one and onto then it is called a bijective function.

If f : A B is a bijective function then n( A ) = n( B )

Given, n( B ) = 7
n( A ) = 7

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