From version 1.3, FsRandom supports C#'s query syntax.
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using FsRandom;
using RNG = FsRandom.RandomNumberGenerator;
var generator =from x in RNG.Standard // [0, 1)from y in RNG.Standard
let z = x + y
select z /2;
var result = RandomModule.Get(generator, UtilityModule.DefaultState);