Let a, B and C be three events, then at least one occurrence of a, B and C is expressed as_________ .
AUBUC
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Event a = {a, B, C}, event B = {a, B}, then event a + B is
If event a contains B and B contains C, then a contains C
Yes, we can regard it as three concentric circles. The innermost circle is C, the middle circle is B, and the outermost circle is a. since C is in B, and B circle is in a, C must be in a