https://math.stackexchange.com/questions/5134250/comparing-the-number-of-letters-in-permutations-of-english-alphabet
solution verification - Comparing the number of letters in permutations of English alphabet. -...
Just for fun, I attempted this question: Consider the permutations of all the $26$ letters of the English alphabet. In how many such permutations will the...
english alphabetsolutionverificationcomparingnumber