You can actually see the 75% cap at work in the table above, if indirectly: notice that the probability of a silver crop actually goes down once the probability of a gold crop crosses the 37.5% threshold.
Finally, the probability that a crop is normal quality is the same as the probability that the crop is neither silver nor gold quality. Because Since it can't be both silver probability is first determined by or gold, the formula issimplifies to:
<code>
P(not silver | not goldnormal) = 1 - P(not silver) * - P(not gold)
</code>
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