Question

The number of ways that 8 beads of different colours be strung as a necklace is

Answer 1

Answer:

2520

Step-by-step explanation:

No. of beads to be arranged = n = 8

Hence the number of ways = (n-1)!/2 = 7!/2 = 2520

Answer 2

2520 Ways 8 beads of different colours be strung as a necklace if can be wear from both side

Step-by-step explanation:

The number of ways that 8 beads of different colours be strung as a necklace is 7!/2  = 5040/2 = 2520 Ways

A necklace is circular -

Lets fix Position of one Bead

then 7 beads can be arranged in 7!  Ways = 5040

Now as it a necklace and if it can be Wear from both sides

Flipping its sides will reduce ways to half

Hence Number of Ways  = 5040/2 = 2520

if Necklace can not be wear from both side then 5040 Ways

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