Skip to content / Đến nội dung
ThichHocToan.com

2025 AMC 12B Question 18

AMC12 · 2025 AMC 12B

Question 18

Awnik repeatedly plays a game that has a probability of winning of $\dfrac{1}{3}.$ The outcomes of the games are independent. What is the expected value of the number of games he will play until he has both won and lost at least once?
  1. $\dfrac{5}{2}$
  2. $3$
  3. $\dfrac{16}{5}$
  4. $\dfrac{7}{2}$
  5. $\dfrac{15}{4}$