Arithmetic Ability
Permutations and Combinations

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Q.

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

View Answer

Correct choice: A

Explanation:

The number of ways of arranging n beads in a necklace is (n−1)!/2=(8−1)!/2=7!/2 = 2520 (since n = 8)
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