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How many different signals can be made by 5 flags from 8 flags of different colours ?

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  2. Prove that .^nPr = ^(n-1)Pr + r^(n-1)P(r-1)

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  3. How many different signals can be made by 5 flags from 8 flags of diff...

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  4. How many permutations can be made out of the letters of the word 'TRIA...

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  7. Find the number of permutations that can be had from the letters of th...

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  8. Find the number of permutations that can be had from the letters of th...

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  9. In how many ways can 24 persons be seated round a table, if there are ...

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  13. How many different selections of 6 books can be made from 11 different...

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  14. How many different selections of 6 books can be made from 11 different...

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  15. A student is allowed to select at most n books from a collection of (2...

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  16. Find the number of combination that can be formed with 5 oranges, 4 ma...

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  17. Find the number of combination that can be formed with 5 oranges, 4 ma...

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  19. In how many ways can a pack of 52 cards divided in 4 sets, three of th...

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