The number of tails showing when flipping four coins is a discrete random variable. Denote it by X. The possible values of X are 0, 1, 2, 3, 4. Calculate the following probabilities. Enter their exact values. P(X 0) = P(X - 1) = P(X 2) = P(X = 3) = P(X 4) = P(X 2 2) =

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