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+2 votes
20.2k views
in Relations and Functions by (47.8k points)
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If f: A → B is a bijective function and if n(B) = 7, then n(A) is equal to 

(1) 7 

(2) 49 

(3) 1 

(4) 14

1 Answer

+1 vote
by (47.4k points)
selected by
 
Best answer

(1) 7

In a bijective function, n(A) = n(B) 

⇒ n(A) = 7

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