How many different three-letter words can be made

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Reference no: EM131294871

1. How many different nine-digit social security numbers can be made if

a. No digit is allowed to be repeated.

b. The digits can be repeated.

2. How many different three-letter "words" can be made from the 26 letters of the English alphabet without regard to vowels if the letters can be used more than once per word?

Reference no: EM131294871

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