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The English alphabet has 5 vowels and 21...

The English alphabet has 5 vowels and 21 consonants. How many words with two different vowels and 2 different consonants can be formed from the alphabet ?

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MODERN PUBLICATION-PERMUTATIONS AND COMBINATIONS-EXERCISE
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  6. How many 4-letter words, with or without meaning, can be formed out of...

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  9. Three married couples are to be seated in a row having six seats in a ...

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  10. A group consists of 4 girls and 7 boys. In how many ways can a team of...

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  11. A group consists of 4 girls and 7 boys. In how many ways can a team of...

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  12. A group consists of 4 girls and 7 boys. In how many ways can a team of...

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  13. A committee of 7 has to be formed from 9 boys and 4 girls. In how many...

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  14. A committee of 7 has to be formed from 9 boys and 4 girls. In how many...

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  15. A committee of 7 has to be formed from 9 boys and 4 girls. In how many...

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  16. Determine the number of 5 cards combination out of a deck of 52 cards ...

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  17. The English alphabet has 5 vowels and 21 consonants. How many words wi...

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  18. Find the number of permutations of n different things taken r at a tim...

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  19. A coin is tossed 5 times. Determine the number of ways in which 0 head...

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  20. Six X 's have to be placed in the squares of the figure below, such th...

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