If 8 ships out of 10 ships arrive safely. Find the probability that at least one would arrive safely out of 5 ships selected at random.
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Explanation:
P(safely reaches) = 1/3 P(not reaches safely) = 1 - 1/3 = 2/3
P(at least 4 arrive safely)
= P(4) + P(5) = 5C4 (1/3)4 (2/3) + 5C5 (1/3)5
= 11/35 = 11/243
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