442.Five Before Snake Eyes
★★★conditional probabilityCh. 2 — Axiomatic and Conditional Probability444+ Problems in Probability
Two fair dice are rolled repeatedly. What is the probability that a sum of 5 appears before a sum of 2?
Sign in to submit an answer and track it toward your stats.
Sign inHint
Ignore every roll that is neither. What is the conditional probability that a decisive roll is a 5?
Want timed drills, mental math, and a market-making game too? Try the full practice suite →