26. The game of craps is played as follows: A player rolls two dice. If the sum of the dice is either a 2, 3, or 12, the player loses; if the sum is either a 7 or an 11, the player wins. If the outcome is anything else, the player continues to roll the dice until she rolls either the initial outcome or a 7. If the 7 comes first, the player loses, whereas if the initial outcome reoccurs before the 7 appears, the player wins. Compute the probability of a player winning at craps. Hint: Let E, denote the event that the initial outcome is 12 i and the player wins. The desired probability is ΣP(E;). i=2 To compute P(E;), define the events Ein to be the event that the initial sum is i and the player wins on the nth roll. 8 Argue that P(E;) = Σ P(Ein). n=1

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26. The game of craps is played as follows: A player rolls
two dice. If the sum of the dice is either a 2, 3, or 12, the
player loses; if the sum is either a 7 or an 11, the player
wins. If the outcome is anything else, the player continues
to roll the dice until she rolls either the initial outcome or a
7. If the 7 comes first, the player loses, whereas if the initial
outcome reoccurs before the 7 appears, the player wins.
Compute the probability of a player winning at craps.
Hint: Let E; denote the event that the initial outcome is
12
i=2
i and the player wins. The desired probability is P(E;).
To compute P(E;), define the events Ein to be the event
that the initial sum is i and the player wins on the nth roll.
∞
Argue that P(E₁) = P(Ein).
n=1
Transcribed Image Text:26. The game of craps is played as follows: A player rolls two dice. If the sum of the dice is either a 2, 3, or 12, the player loses; if the sum is either a 7 or an 11, the player wins. If the outcome is anything else, the player continues to roll the dice until she rolls either the initial outcome or a 7. If the 7 comes first, the player loses, whereas if the initial outcome reoccurs before the 7 appears, the player wins. Compute the probability of a player winning at craps. Hint: Let E; denote the event that the initial outcome is 12 i=2 i and the player wins. The desired probability is P(E;). To compute P(E;), define the events Ein to be the event that the initial sum is i and the player wins on the nth roll. ∞ Argue that P(E₁) = P(Ein). n=1
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