The Greek alphabet contains 24 letters. How many fraternity names with Greek letters can be formed if each fraternity name contains 3 letters and repetition of letters is not permitted? (So for permutations, usually you can just multiply it like three times. so normally you would do it like 24*24*24 and that equals 13,824 but that is not the correct answer, the correct answer is 12,144. How?)
It says “no repetition is allowed” So for the first letter - 24 letters allowed For the second letter - 1 letter had already been used, so 23 letters remain Last letter - 22 letters remain So 24 * 23 * 22
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