How many "words" can the letters of "BRILLIANT" be formed into if every letter is used once? The answer is a five-digit number. Find the sum of the digits of the number.
Ex: ("RIILLANTB", "ILLIANTRB" are defined as "words".)
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The number of words that can be formed = 2 ! × 2 ! 9 ! because there are 9 alphabets and L and I repeat twice. So, the number of words that can be formed = 9 0 7 2 0 . So, the sum of the digits = 9 + 0 + 7 + 2 + 0 = 1 8 .