458.The Dented Die
★★★classical probabilityCh. 2 — Axiomatic and Conditional Probability444+ Problems in Probability
A fair 6-sided die has values 1–6. One side, chosen uniformly at random, has its value decreased by 1 (a 1 becomes a 0). The modified die is then rolled once. Find the probability that an even value shows.
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Condition on which side was dented — and remember that 0 is even.
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