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Math Help - counting methods- urgent question

  1. #1
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    Exclamation counting methods- urgent question

    There are 5 vowels and 21 consonants in the English alphabet. How many different four-letter "words" can be formed that contain 2 different vowels and 2 different consonants?
    explanations would be greatly appreciated thnxu!!!!!
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  2. #2
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    \left( 4! \right) {5 \choose 2}{21 \choose 2}??
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