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

• Sum of first n terms of a harmonic progression

  520 Solvers

• Cumulative product of a vector

  302 Solvers

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

  405 Solvers

• Transpose of matrix

  337 Solvers

• Number of Even Elements in Fibonacci Sequence

  1681 Solvers

More from this Author92

• Sum Rows

  70 Solvers

• Happy Free Wednesday!

  45 Solvers

• Is there a GPU Device?

  75 Solvers

• Ordinary Annuity : Future Value

  49 Solvers

• Bridge and Torch Problem - Probability

  5 Solvers