Problem 45189. Double Factorial

        n(n-2)...(5)(3)(1),   n>0, odd
n!!  =  n(n-2)...(6)(4)(2),   n>0, even
        1                 ,   n = -1, or n = 0

Solution Comments

Problem Recent Solvers69

Suggested Problems

• Arrange Vector in descending order

  13843 Solvers

• Check that number is whole number

  5432 Solvers

• Flip the vector from right to left

  11265 Solvers

• Volume of a box

  731 Solvers

• Perimeter of a semicircle

  2304 Solvers

More from this Author92

• Peg Solitaire - Get Possible Moves

  5 Solvers

• Simple return on investment

  103 Solvers

• Dealing with correlation results!

  34 Solvers

• Fill the matrix - 1

  66 Solvers

• Go back n times

  49 Solvers