Numeracy

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Two red snooker balls, one white and one yellow are put into a bag. The referee picks out two of them and tells you that at least one of those selected is red. What is the chance that both are red?

(Answer on Tuesday)

Yesterday's answers:

3 minutes. (If the length of the escalator is l, its speed is e and my speed is m, then l/(m+e)=1 and l/(m-e)=3. Hence m=2e and l/e=3.

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