InverseGamma Command

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InverseGamma( <Alpha>, <Beta>, <Probability> )
Computes the inverse of cumulative distribution function of gamma distribution at probability p, where the gamma distribution is given by parameters Alpha and Beta.
In other words, finds t such that P(X ≤ t) = p, where X is random variable with gamma distribution.
Probability p must be from [0,1].
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