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A coin is biased so that heads is twice as

A coin is biased so that heads is twice as likely as tails. For three independent tosses of the coin, Find

(a) The probability distribution of X, the total number of heads;

(b) The probability of getting at most two heads.

(a) The probability distribution of X, the total number of heads;

(b) The probability of getting at most two heads.

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