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Four young kids want to exchange their toys, so that each one of them gets a new toy. The number of ways they can exchange the toys is :

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Four young kids want to exchange their toys, so that each one of them gets a new toy. The number of ways they can exchange the toys is :

(A) 3 

(B) 7 

(C) 9 

(D) 24

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Best answer

Correct option: (C) 9

Explanation:

Derangement of 4 objects

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