In how many ways can the letters of the word PERMUTATIONS be arranged if the words start with P and end with S?
Question
In how many ways can the letters of the word PERMUTATIONS be arranged if the words start with P and end with S?
Solution
To solve this problem, we need to use the concept of permutations in combinatorics. Here are the steps:
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The word "PERMUTATIONS" has 12 letters in total. However, since we want the words to start with 'P' and end with 'S', we are left with 10 letters to arrange.
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Among these 10 letters, we have some repetitions. The letter 'T' appears twice, and the letter 'A' appears twice.
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The number of ways to arrange 'n' distinct items is given by 'n!'. However, if there are repetitions, we need to divide by the factorial of the number of repetitions.
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So, the number of ways to arrange the 10 letters 'E', 'R', 'M', 'U', 'T', 'T', 'I', 'O', 'N', 'A', 'A' is 10! / (2! * 2!).
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Therefore, the letters of the word "PERMUTATIONS" can be arranged in 10! / (2! * 2!) ways if the words start with 'P' and end with 'S'.
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