377.Sum of 4 Before Sum of 2
★★★classical probabilityCh. 2 — Axiomatic and Conditional Probability444+ Problems in Probability
Jed rolls two fair 6-sided dice repeatedly. Find the probability that Jed obtains a sum of 4 before a sum of 2.
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All other sums are irrelevant — condition on the first roll that is a 4 or a 2.
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