BigInt Bug or just me?

[Tyro[17]]

On Saturday, 21 April 2012 at 14:30:49 UTC, Jordi Sayol wrote:
> Al 21/04/12 16:07, En/na Tyro[17] ha escrit:
>> Why does the following implementation of the binomial 
>> coefficient yield two different answers?
>> 
>
> Only happens when compiling to 32-bit.
>
> 32-bit:
> (40  20) = 137846528820
> (40  20) = 68923264410
>
> 64-bit:
> (40  20) = 137846528820
> (40  20) = 137846528820

Actually, in that case it only happens when compiling to 64-bit.

Note: comb1(BigInt(40), BigInt(20))/2; The the BigInt version is
being divided by two (on MAC OS X) in order to yield the
correct result.