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

• Back to basics 8 - Matrix Diagonals

  973 Solvers

• Angle between two vectors

  798 Solvers

• Delete 2nd and 5th column of Given 6*6 matrix

  173 Solvers

• Product of Array

  290 Solvers

• Test Problem; Create a 5x5 array containing all ones

  405 Solvers

More from this Author92

• Integer to boolean

  44 Solvers

• Challenging perms function!

  12 Solvers

• Find a real root of a quintic function without using roots function

  16 Solvers

• Create co-occurrence matrix

  18 Solvers

• Compound Interest: Present Value

  55 Solvers