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Problem 13 - Olympiad
Which of the following events is 'impossible'?
A. Getting heads when tossing a coin
B. Picking a red ball from a bag containing only blue balls
C. It raining tomorrow
D. Getting an even number when rolling a die
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Correct: B
An impossible event is one that has no chance of occurring. If a bag contains only blue balls, it is physically impossible to pick a red ball from it. The other events have a possibility, even if it's small (like rain).