Factorial and Prime

  1. Factorial is defined only for natural numbers( no fractions and no negative numbers).
  2. 0! = 1
  3. Unit digit of factorial of any number greater than 5 is always 0. 
  4. Exponent of a in in n!( Highest power of a in n!). a is a prime number. 11:54
  5. Number of 0 in n!  24:00
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