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A four sided fair dice (with the sides marked 1,2,3 and 4) is rolled 4 times. Let X= smallest value of the four rolls. a)

A four sided fair dice (with the sides marked 1,2,3 and 4) is rolled 4 times. Let X= smallest value of the four rolls.

a) Find the pmf of X.

b) Find E(X)

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