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

• Longest run of consecutive numbers

  6734 Solvers

• Count ones

  364 Solvers

• Back to basics - mean of corner elements of a matrix

  467 Solvers

• Product of Array

  290 Solvers

• Rotate a matrix for 180 degree

  188 Solvers

More from this Author92

• Sum Rows

  70 Solvers

• Find the biggest digit in a matrix

  59 Solvers

• Low level NaN

  66 Solvers

• Compound Interest: Interest Rate

  61 Solvers

• Compound Interest: Present Value

  55 Solvers