Question
Three people toss a fair coin and the odd one pays for coffee. If the coins all turn up the same, they are tossed again. Find the probability that fewer than 3 tosses are needed.
Step 1
Since the coin is fair, the probability of getting a head or a tail is 1/2. Therefore, the probability of getting three heads or three tails is (1/2)^3 = 1/8. Since there are two such outcomes (either all heads or all tails), the total probability of these Show more…
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