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Count the ways in which 10 different beads can be strung into a necklace.

Competition practiceProbability & Permutation
  • A1,81,440
  • B3,62,880
  • C18,14,400
  • D36,28,800

Step-by-Step Solution

Circular arrangement ; a necklace can be flipped, so divide by 2: .
Answer: A) 1,81,440

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