Question
Nine boys have to stand in a circle. In how many ways
they are to be stand on the circumference of circle?Solution
Any boy may be stand on any place so there is no difference in clockwise and anticlockwise direction here.  Requirement permutations = 1/2 × (n - 1)!  => 1/2 × (9 - 1)!  => 1/2 × 8!  => 20160
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