using 5.10.1, Math::BigInt 1.89 I get 
2 choose 0 = 3
2 choose 0 = 3
2 choose 0 = 3
2 choose 0 = 3

[download]

I then updated to Math::BigInt 1.997 and I get

2 choose 0 = 1
2 choose 0 = 1
2 choose 0 = 1
2 choose 0 = 1

[download]

Looks like you found a bug that's been fixed. (and helped me update...)

In reply to Re^2: BigInt bug? by bitingduck
in thread BigInt bug? by shao.lo

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