Gifts when Purchasing 25 TCs
Players who purchase 25 TCs will now receive a free gift box with their purchase which can contain another TC, potion, or one of two very rare hats. Everyone who has made such a purchase in the past week has retroactively received this gift.
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Computing the probability that at least one of the following events will occur:
P(a or b ... or z) = 1 - P(!a and !b ... and !z)
Probability
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Gifts when Purchasing 25 TCs
