self Maths Puzzle

How many arrangements can be made of the letters of the word “ASSASSINATION”? In how many of them are the vowels always together?

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self Other Question

If 2^a+1=a,
then 12^a+6^a+1=?



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?