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Permutation: n Different Things Taken r at a Time

How many word...

Question

How many words, with or without meaning, can be formed by using all the letters of the word 'DELHI', using each letter exactly once?

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Solution

There are 5 letters in the word DELHI.
Number of 5 letter words = Number of arrangements of 5 letters, taken 5 at a time
= ⁵P₅ = 120

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Permutation: n Different Things Taken r at a Time

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