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Q.
The number of ways in which 5 beads of different colours form a necklace is
A.
12
B.
24
C.
120
D.
60
E.
None of the above
View Answer
Correct choice: A
Explanation:
The number of ways in which 5 beads of different colours can be arranged in a circle to form a necklace are (5-1)!=4!.
But the clockwise and anticlockwise arrangement are not
Hence the total number of ways of arranging the beads 1/2(4!)=12 .
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