Home
Class 12
MATHS
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

720

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • SOLVED PAPER 2017

    BITSAT GUIDE|Exercise PART (IV) Mathematics)|45 Videos

  • SOLVED PAPER 2018

    BITSAT GUIDE|Exercise Mathematics (Part-IV)|45 Videos

Similar Questions

Explore conceptually related problems

There are 3 letters and 3 envelopes. Find the number of ways in which all letters are put in the wrong envelopes

A person writes letters to six friends and addresses the corresponding envelopes.In how many ways can the letters be placed in the envelopes so that

A person writes letters to 6 friends and addresses a corresponding envelope. The number of ways in which 5 letters can be placed in the wrong envelope is?

There are 5 letters and 5 directed envelopes. The number of ways in which all the letters can be put in wrong envelope is

Ravish writes letters to his five friends and addresses the correspondig envelopes.The total number of ways in which letters can be placed in the envelopes so that at least two of them are in the wrong envelopes,is

There are 4 envelops and 4 letters are to be put in these envelopes randomly, then number of ways such that at least 2 letters are placed in wrong envelope.

There are 4 letters and 4 addressed envelopes. Find the probability that all the letters are not dispatched in right envelopes.

BITSAT GUIDE-SOLVED PAPER 2019 BITSAT-PART -IV ( Mathematics )
  1. The area bounded by two branches of the curve (y-x)^2= x^3 and x = 1 e...

    Text Solution

    |

  2. The least value of the function f(x) = int(0)^(x) ( 3 sinx + 4 cos x )...

    Text Solution

    |

  3. If z(1) and overline(z)(1) represent adjacent vertices of a regular po...

    Text Solution

    |

  4. In the expansion of (1+x+x^3+x^4), the coefficient of x^4 is ^40 C4 b....

    Text Solution

    |

  5. A person writes letters to six friends and addresses the corresponding...

    Text Solution

    |

  6. If x=log(5)3+log(7)5+log(9)7,then x is ge?

    Text Solution

    |

  7. Let pa n dq be the roots of the equation x^2-2x+A=0 and let ra n ds be...

    Text Solution

    |

  8. Let a,b,c in R and the system of equations (1-a)x+y+z=0,x+(1-b)y+z=0,x...

    Text Solution

    |

  9. If A is a 3xx3 non-singular matrix such that "AA"'=A'A and B=A^(-1)A',...

    Text Solution

    |

  10. If sin^(-1)x + tan ^(-1) x = (pi)/(2), then prove that 2x^(2) + 1 =...

    Text Solution

    |

  11. Find the number of solution of the equations |cos x |=[x], (where ...

    Text Solution

    |

  12. Let cos(alpha+beta)=(4)/(5) and let sin(alpha-beta)=(5)/(13), where 0 ...

    Text Solution

    |

  13. Cards are drawn one-by-one at random from a well-shuffled pack of 52 ...

    Text Solution

    |

  14. If a=hati+2hatj+3hatk,b=-hati+2hatj+hatk and c=3hati+hatj. If (a+b) bo...

    Text Solution

    |

  15. Let f(x) = x[x] , x cancelin Z [.] denotes greatest integer function)...

    Text Solution

    |

  16. The difference of maximum and minimum values of f(x) = x^(2) e^(-x) is

    Text Solution

    |

  17. If f'(x) = f(x)+ int (0)^(1)f (x) dx and given f (0) =1, then int f (x...

    Text Solution

    |

  18. The distance between the origin and the normal to the curve y=e^(2x)+x...

    Text Solution

    |

  19. Reflection of the line (x-1)/-1=(y-2)/3=(z-3)/1 in the plane x +y +z...

    Text Solution

    |

  20. If x,y,z in R , x +y+z =5 x^(2) +y^(2)+z^(2)=9 then length of interva...

    Text Solution

    |