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English alphabet has 5 vowels and 21 con...

English alphabet has 5 vowels and 21 consonants. How many 4 letter words with two different vowels and two different consonants can be formed without repetition of letters?

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MAXIMUM PUBLICATION-QUESTION PAPER MARCH 18-EXAMPLE
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  16. If 'nPr'=840,nCr=35 , find r.

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  17. English alphabet has 5 vowels and 21 consonants. How many 4 letter wor...

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