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9 Different letters of an alphabet are g...

9 Different letters of an alphabet are given. Find the number of 4 letter words that can be formed using these 9 letters which have (i) no letter is repeated (ii) atleast one letter is repeated.

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The correct Answer is:
`9P_(4)` `9^(4)-9P_(4)=3537`
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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-EXERCISE -1.2 VERY SHORT ANSWER QUESTIONS
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  2. Find the number of 5 letter words that can be formed using the letters...

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  8. Find the number of 4 - digit telephone numbers that can be formed usin...

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  12. Find the the number of functions from a set A containing 5 elements in...

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  13. Find the number of injections from a set A containing 4 elements into ...

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  14. Find the number of surjections from a set A containing 6 elements into...

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  15. Find the number of bijections from a set A containing 7 elements onto ...

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  16. Find the number of (i) 6 (ii) 7 letter palindromes that can be formed ...

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