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IKMC 2027 - Grades 11-12 - Self-study SET 9 - Thematic Batch 3 Question 4

IKMC · IKMC 2027 - Grades 11-12 - Self-study SET 9 - Thematic Batch 3

Question 4

Alice and Bob play a dice game. First they draw lots to choose who starts. They then take turns rolling a die until someone rolls a 3 or a 6; that player wins. What is the probability that Alice wins in at most two of her rolls?

Editorial clarification: The limit is two rolls by Alice herself; the die and the initial draw are fair.

Question illustration
  1. 85/243
  2. 65/162
  3. 45/81
  4. 39/81
  5. 39/162