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Question
How many words (with or without dictionary meaning) can be made from the letters in the word MONDAY, assuming that no letter is repeated, if 4 letters are used at a time?
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Solution
Total number of words by taking 4 letters out of 6 at a time = `""^("6")"P"_4` = 6 x 5 x 4 x 3 = 360 whereas words can be with or without meaning.
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