Well the way I'd do it is like this:
(number of times same unknown probability appears) x p + Sum(known probabilities) = 1
where p is the probability you want for the rest of your numbers.
then solve for p.
p = (1 - Sum(known probabilities))/((number of times same unknown probability appears)
Maybe I made an obvious mistake or misunderstood the question.
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"I am the wrath of God. The earth I pass will see me and tremble." -Klaus Kinski as Don Lope de Aguirre
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