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  1. or download this
    2 * 3 * 4 * 5 * 6 =
|   |       |   |
...
12 * 60 =

120
  2. or download this
    sub fact8{
  #divide and conquer without recursion
...
perl fact.pl 5000
Method 8 (new func): 28 wallclock secs (28.65 usr +  0.00 sys = 28.65 
+CPU)
Method 7 (your func): 30 wallclock secs (29.06 usr +  0.00 sys = 29.06
+ CPU)