A fair coin is tossed three times and the events A, B, and C 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 0 is an even number): (a) P(not A) = C] (b) P((not A) and B) = [:] (c) P( (not A) or (not. B) or C) = C] In how many ways can 5 pizza toppings be choosen from 12 available toppings? Your answer is : [:]