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Given 4 flags of different colours, how ...

Given 4 flags of different colours, how many different signals can be generated, if a signal requires the use of 2 flags one below the other?

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KUMAR PRAKASHAN-PERMUTATIONS AND COMBINATIONS-TEXTBOOK ILLUSTRATIONS FOR PRACTICE WORK
  1. Find the number of 4 letter words, with or without meaning, which can ...

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

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  3. How many 2 digit even numbers can be formed from the digits 1, 2, 3, ...

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  4. Find the number of different signals that can be generated by arrangin...

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  5. Evaluate : (i) 5 ! (ii) 7 ! (iii) 7 ! - 5 !

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  6. Compute (i) (7!)/(5!) (ii) (12!)/((10!)(2!)

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  7. Evaluate (n!)/(r!(n-r)!), when n = 5, r = 2.

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  8. If (1)/(8!)+(1)/(9!)=(x)/(10!), find x.

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  9. Find the number of permutations of the letters of the word ALLAHABAD.

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  10. How many 4-digit numbers can be formed by using the digits 1 to 9 if ...

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  11. How many numbers lying between 100 and 1000 can be formed with the di...

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  12. Find the value of n such that, ""^(n)P(2)=30

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  13. Find r, if 5""^(4)P(r)=6""^(5)P(r-1)

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  14. Find the number of different 8-letter arrangements that can be made f...

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  15. In how many ways can 4 red, 3 yellow and 2 green discs be arranged in...

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  16. Find the number of arrangemements of the letters of the word INDEPEDEN...

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  17. If ""^nc9= ^nc17.

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  18. A committee of 3 persons is to be constituted from a group of 2 men an...

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  19. What is the number of ways of choosing 4 cards from a pack of 52 play...

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  20. How many words, with or without meaning, each of 3 vowels and 2 conso...

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