Q3 of 30 Page 7

How may 4-letter code words are possible using the first 10 letter of the English alphabet, if no letter can be repeated?


The number of 4 letter code words out of the first 10 letters of the English

 Alphabets are = 10 × 9 × 8 × 7
                     = 80 × 63
                     = 5040 ways.
 

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