[Haskell-cafe] Unresolved overloading error

[Scott Brown]

I have written this code in Haskell which gives an unresolved overloading error.
The function bernoulli should give the probability of j successes occuring in n trials, if each trial has a probability of p.

> fac 0 = 1
> fac n = n * fac(n - 1)

> binom n j = (fac n)/((fac j)*(fac (n - j)))

> bernoulli n p j = (binom n j)*(p ^ j) * ((1 - p)^(n - j))

However, bernoulli 6 0.5 3 gives the error:

ERROR - Unresolved overloading
*** Type       : (Fractional a, Integral a) => a
*** Expression : bernoulli 6 0.5 3

Why doesn't Haskell infer the types? What kind of type casting or type definition can I use to fix the error?

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