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House No1: 4C 1P 2G
House No2: 2C 2P 3G
House No3: 1C, 1G
Q6(iii)
Given that the person chosen by the method in part (ii) is a grandparent, calculate the probability that there is also a parent living in the house.
How do we do this question?
PS: The answer to part (ii) is 17/42
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