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How many 4-letter words with or without meaning, can be formed out of the letters of the word, LOGARITHMS, if repetition of letters is not allowed?

40
400
50400
2520
Explanation:

The Word LOGARITHMS is containing 10 letters.

To find how many 4 letter word we can find from that = 10 $\times$ 9 $\times$ 8 $\times$ 7.

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