mynamequin mynamequin
  • 22-02-2018
  • Mathematics
contestada

How many sets of 7 questions can be chosen from a file of 25 questions?

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mathmate
mathmate mathmate
  • 22-02-2018
If all 25 questions are different,

When order of selection counts:
P(25,7)
=25!/(25-7)!
=15511210043330985984000000/6402373705728000
=2422728000

When order of selection does not count count:
C(25,7)
=25!/(7!*(25-7)!)
=15511210043330985984000000/(6402373705728000*5040)
=480700

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