$I n h o w m a n y w a y s c a n 5 k e y s b e p u t i n a r i n g$

\frac{1}{2} 4!

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\frac{1}{2} 5!

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4!

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5!

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Solution

The correct option is C $4!$
For the circular Permutations, it should be the $\frac{n!}{5}$
Since total no of keys is $5$ so it is divided by $5$

As the ring and turn up site down
So we have to divide $n!$ by $5$ as clockwise cases are same as anticlockwise cases.
Thus we get,
$\frac{5!}{5} = 4!$
This is the right answer.

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