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**multivariablecalc** 1. Three dice are rolled twice. What is the probability that they show the same number if the dice are distinguishable, and if they are not.

2. One Hundred Trout are caught and returned after they are tagged. Later another 100 are caught and found to contain 7 tagged ones. What is the probability of this if the lake contains n trout? What is your guess at to the true value of n?

these both came off very tricky to me. Can someone take the time to explain? thanks in advance!