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Four children are running a race . ...

Four children are running a race .
(i) In how many ways can the first two places be filled ?
(ii) In how many different ways could they finish the race ?

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PREMIERS PUBLISHERS-COMBINATORICS AND MATHEMATICAL INDUCTION-EXERCISE 4.1
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  4. Count the number of three - digit numbers which can be formed from t...

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

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

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

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

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

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

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  18. How many numbers are there between 1 and 1000 (both inclusive ) whi...

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