please use discrete math to solve

Problem 4: Repeated Permutations a) In how many ways the letters of the word "SUNDAY" be arranged? b) In how many ways the letters of the word "MATHEMATICS" be arranged? c) Suppose there are piles of identical red, blue, and green balls where each pile contains at least 10 balls. In how many ways can 10 balls be selected? Problem 4: Repeated Permutations a) In how many ways the letters of the word "SUNDAY" be arranged? b) In how many ways the letters of the word "MATHEMATICS" be arranged? c) Suppose there are piles of identical red, blue, and green balls where each pile contains at least 10 balls. In how many ways can 10 balls be selected