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Distribution uniform
Mean (x-1)/2+y
Standard deviation sqrt((x^2-1)/12)

rn1(x, y)[1] is a pseudo-random number macro used in NetHack when a result should be unweighted. It is equivalent to rn2(x) + y. The range of values is between y and y+x-1 inclusive (that is, y<=rn1(x,y)<x+y).

See also rn2.


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