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How many numbers between 20,000 and 30,0...

How many numbers between 20,000 and 30,000 can be formed by using the digits 2, 3, 5,6,7, if each digit may be repeated any number of times in any number ?

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MODERN PUBLICATION-PERMUTATIONS AND COMBINATIONS-EXERCISE
  1. How many 5-digit even numbers can be formed using the digits 1,2,5,4,5...

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  2. How many numbers of four digits can be formed by using the digits 1, 3...

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  3. How many numbers between 20,000 and 30,000 can be formed by using the ...

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  4. How many numbers greater than one lac can be formed by using the digit...

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  6. In how many ways can 5 flags, in which 3 are red, one is white and one...

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  10. Find the number of arrangements, which can be made from the letters of...

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  12. Find the number of arrangements, which can be made from the letters of...

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  14. Find the number of arrangements, which can be made from the letters of...

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  15. Find the number of arrangements, which can be made from the letters of...

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  16. Find the number of arrangements, which can be made from the letters of...

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