self Maths Puzzle

en different alphabets are given. Words containing five alphabets are to be formed from them. Find the number of words which have exactly one alphabet repeats?

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self Other Question

How many arrangements can be made of the letters of the word “ASSASSINATION”? In how many of them are the vowels always together? In how many ways can a mixed doubles tennis game be arranged from eight married couples, if no husband and wife play in the same game?