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How many four letter words can be made from the two letters A and B ?

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A N EXCEL PUBLICATION-PERMUTATIONS AND COMBINATIONS-QUESTION BANK
  1. If a child can draw two kinds of faces and three kinds of hats, how ma...

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  2. How many four letter words can be made from the two letters A and B ?

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  3. How many 3 digit odd numbers can be formed by using the digits 1,2,3,4...

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  4. How many 3 digit odd numbers can be formed by using the digits 1,2,3,4...

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  5. How many words (with or without meaning) of three distinct letters of ...

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  6. In how many ways can the following prizes be given away to a class of ...

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  7. How many odd numbers less than 1000 can be formed by using the digit 0...

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  8. How many 3-digit numbers can be formed from the digits 1,2,3,4 and 5 a...

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  9. How many 3-digit numbers can be formed from the digits 1,2,3,4 and 5 a...

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  10. How many 3-digit even numbers can be formed from the digits 1,2,3,4,5,...

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  11. How many 4-letter code can be formed using the first 10 letters of the...

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  12. How many 5-digit telephone numbers can be constructed using the digits...

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  13. A coin is tossed 3 times and the outcomes are recorded. How many possi...

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  14. Given 5 flags of different colours. How many different singnals can be...

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  15. Evaluate 8!

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  16. Evaluate 4!-3!

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  17. Is 3!+4!=7! ?

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  18. Compute (8!)/(6!xx2!)

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  19. if 1/(6!) +1/(7!) = x/(8!) , find x.

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  20. Evaluate (n!)/((n-r)!) n = 6, r = 2

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