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A mobile has a pass code of distinct di...

A mobile has a pass code of distinct digits. What is the maximum number of attempts one makes to retrieve the pass code ?

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PREMIERS PUBLISHERS-COMBINATORICS AND MATHEMATICAL INDUCTION-EXERCISE 4.1
  1. There persons enter into a conference hall in which there are 10 sea...

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  2. In how many ways 5 persons can be seated in a row ?

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  3. A mobile has a pass code of distinct digits. What is the maximum nu...

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  4. Given four flags of different colours, how many different signals can...

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  5. Four children are running a race . (i) In how many ways can the...

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  6. Four children are running a race . (i) In how many ways can the...

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  7. Count the number of three - digit numbers which can be formed from t...

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  8. Count the number of three - digit numbers which can be formed from t...

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  9. How many three - digit numbers are there with 3 in the unit place ? ...

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  10. How many three - digit numbers are there with 3 in the unit place ? ...

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  11. How many numbers are three between 100 and 500 with the digits 0,1...

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  12. How many numbers are three between 100 and 500 with the digits 0,1...

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  13. How many three-digit odd numbers can be formed by using the digits 0...

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  14. How many three-digit odd numbers can be formed by using the digits 0...

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  15. Count the numbers between 999 and 10,000 subject to the condition that...

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  16. Count the numbers between 999 and 10,000 subject to the condition that...

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  17. Count the numbers between 999 and 10,000 subject to the condition that...

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  18. How many three- digit numbers, which are divisible by 5, can be for...

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  19. How many three- digit numbers, which are divisible by 5, can be for...

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  20. To travel from a place A to place B, there are two different bus rout...

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