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Suppose that 'n' letters are written to ...

Suppose that 'n' letters are written to 'n' different persons and their addresses are written on 'n' different envelops. Find the number of ways in which these letters can be put in the envelopes (one in each) such that atleast one letter does not go into the corresponding envelope.

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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-EXERCISE -1.1 SHORT ANSWER QUESTIONS
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  11. How many four digited numbers can be formed using the digits 1,2,5,7,8...

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  12. Find the number of 4-digit numbers that can be formed using the digits...

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  13. If the letters of the word 'RUBLE' are arranged in all possible ways a...

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  14. If the letters of the word MASTER are permuted in all possible ways an...

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  15. Find the sum of all five digited numbers that can be formed using the ...

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  16. Find the sum of all 4- digited numbers that can be formed using the di...

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  17. Find the sum of all 4 digited numbers that can be formed using the dig...

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  18. Suppose that 'n' letters are written to 'n' different persons and thei...

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  19. If the letters of the word BRING are permuted in all possible ways and...

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