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(1 point) A fair coin is tossed three times and the events A, B, and are defined as follows: A: { At least one head is observed } B:{At least two heads are observed } C:{The number of heads observed is odd } Find the following probabilities by summing the probabilities of the appropriate sample points (note that is an even number): (a) P(A) = 0.875 (b) P((not B) and C) = 0.625 (c) P((not A) or B or C) = 0.125