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A person writes letters to six friends a...

A person writes letters to six friends and addresses the corresponding envelopes. Let x be the number of ways so that atleast two of the letters are in wrong envelopes and y be the number of ways so that all the letters are in wrong envelopes. Then, x-y is equal to

A

719

B

265

C

454

D

None of these

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The correct Answer is:
C
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ARIHANT MATHS-PERMUTATIONS AND COMBINATIONS -Exercise For Session 6
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  8. The total number of positive integral solution of 15<x1+x2+x3lt=20 is ...

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  9. Find the total number of positive integral solutions for (x ,y ,z) suc...

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  10. There are 12 points in a plane in which 6 are collinear. Number of dif...

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  11. 4 points out of 11 points in a plane are collinear. Number of differen...

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  12. The number of triangles that can be formed with 10 points as vertic...

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  13. ABCD is a convex quadrilateral and 3, 4, 5, and 6 points are marked...

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  14. There are 10 points in a plane of which no three points are colline...

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  15. 4 points out of 8 points in a plane are collinear. Number of different...

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  16. There are 2n points in a plane in which m are collinear. Number of qua...

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  17. In a polygon the number of diagonals is 54. the number of sides of the...

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  18. In a polygon, no three diagonals are concurrent. If the total numbe...

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  19. If n lines are drawn in a plane such that no two of them are parallel ...

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  20. Six straight lines are in a plane such that no two are parallel & no t...

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