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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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RD SHARMA ENGLISH-COMBINATIONS-All Questions
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  3. The English alphabet has 5 vowels and 21 consonants. How many words...

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  6. There are 10 persons named P1, P2, P3 ..., P10. Out of 10 persons, 5 p...

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  7. Find the number of permutations of n distinct things taken r together,...

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  8. How many words, with or without meaning, each of 3 vowels and 2 con...

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  9. The number of permutations of n things taken r at a time if 3 particul...

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  11. If C(35, n+7)= C(35, 4n-2) then all the values of n are

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  12. Write the number of diagonals of an n-sided polygon.

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  13. Write the expression \ ^n C(r+1)+\ ^n C(r-1)+2xx\ ^n Cr in the simples...

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  14. There are 3 letters and 3 directed envelopes. Write the number of ways...

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  15. Write the maximum number of points of intersection of 8 straight lines...

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  16. The number of parallelograms that can be formed from a set of four par...

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  17. The number of ways in which 12 students can be equally divided into th...

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  18. Write the total number of words formed by 2 vowels and 3 consonants ...

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  19. If \ ^20 Cr=\ ^20 C(r-10) ,\ t h e n\ \ ^18 Cr is equal to 'a. 4896 ...

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  20. If \ ^(20)Cr=\ ^(20)C(r+4),\ t h e n\ \ ^r C3 is equal to a. 54 b. 56 ...

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