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 0 is an even number):   (a) P(\textrm{not }B) =    (b) P(B \textrm{ or } C) =    (c) P(A \textrm{ and } B \textrm{ and } C) =

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