How well does this handle a biased source of random numbers in one or more of the inputs? If someone has set up your random number source to be more easily expl

How well does this handle a biased source of random numbers in one or more of the inputs? If someone has set up your random number source to be more easily exploitable (or just done a really bad job setting it up), does combining it with another poor source with this approach mean the results are still useful?