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June 2013 p63 q2
2558
The 12 houses on one side of a street are numbered with even numbers starting at 2 and going up to 24. A free newspaper is delivered on Monday to 3 different houses chosen at random from these 12. Find the probability that at least 2 of these newspapers are delivered to houses with numbers greater than 14.
Solution
Let the houses with numbers greater than 14 be 16, 18, 20, 22, and 24. There are 5 such houses.
We need to find the probability that at least 2 newspapers are delivered to these 5 houses.
This can be calculated as \(P(2) + P(3)\) or \(1 - P(0, 1)\).