Five digits are chosen randomly from the set {0,1,2, ..., 9} a.) What is the probability that all five digits are the same ? b.) What is the

Five digits are chosen randomly from the set {0,1,2, ..., 9}

a.) What is the probability that all five digits are the same?

b.) What is the probability that four or more of the digits of the same?

(Please show your work so I can understand how you got the answer!)