A) \[\frac{1}{2}4!\]
B) \[\frac{1}{2}5!\]
C) \[4!\]
D) \[5!\]
Correct Answer: A
Solution :
Key Idea: The n keys can be put in a key ring in\[\frac{(n-1)!}{2}.\] The total number of ways that five keys can be put in a ring is \[\frac{(5-1)!}{2}=\frac{4!}{2}\] [Since in a key ring either we put clockwise or anticlockwise both will have same case]You need to login to perform this action.
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