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Question

Number of ways in which 200 people can be divided into 100 pairs is
  1. (200!)2100(100)!
  2. 1.3.5199
  3. (200!)(100)!
  4. (1012),(1022)(2002)


Solution

The correct options are
A (200!)2100(100)!
D (1012),(1022)(2002)
No. of ways =(200!)2100(100)!
=(1012)(1022)(2002)

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