Home
Class 12
MATHS
The number of different seven digit numb...

The number of different seven digit numbers that can be written using only three digits 1, 2 &3 under the condition that the digit 2 occurs exactly twice in each number.

A

672

B

640

C

512

D

none

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • THEORY AND EXERCISE BOOK

    MOTION|Exercise EXERCISE -2 (LEVEL - I)|23 Videos

  • THEORY AND EXERCISE BOOK

    MOTION|Exercise EXERCISE - 2 (LEVEL -II)|18 Videos

  • TANGENT & NORMAL

    MOTION|Exercise EXERCISE 4|14 Videos

  • THREE DIMENSIONAL GEOMETRY (3 -D)

    MOTION|Exercise SOLVED EXAMPLE|33 Videos

Similar Questions

Explore conceptually related problems

The number of different seven digit numbers that can be written using only three digits 1,2 E3under the condition that the digit 2 occurs exactly twice in each number.

The number of different seven-digit numbers that can be written using only the three digits 1,2, and 3 with the condition that the digit 2 occurs twice in each number is a.^(2)P_(5)2^(5) b.^7C_(2)2^(5) c.^(7)C_(2)5^(2) d.none of these

The number of 6-digit numbers that can be formed using the three digits 0,1 and 2, is

The number of 4 digit numbers that can be made using exactly two digits out of 1,2,3,4,5,6 and 7

MOTION-THEORY AND EXERCISE BOOK-EXERCISE - 4 (LEVEL -II)
  1. The number of different seven digit numbers that can be written using ...

    Text Solution

    |

  2. The number of arrangements of the letters of the word BANANA in whi...

    Text Solution

    |

  3. Number of points with integral co-ordinates that lie inside a triangle...

    Text Solution

    |

  4. Using permutation or otherwise, prove that (n^2)!/(n!)^n is an integer...

    Text Solution

    |

  5. r, s, t are prime numbers and p, q are natural numbers such that LCM o...

    Text Solution

    |

  6. The letters of the word COCHIN are permuted and all the permutation...

    Text Solution

    |

  7. Consider all possible permutations of the letters of the word ENDEANOE...

    Text Solution

    |

  8. The number of seven digit integers, with sum of the digits equal to 10...

    Text Solution

    |

  9. Let S={1,,2,34} . The total number of unordered pairs of disjoint s...

    Text Solution

    |

  10. The total number of ways in which 5 balls of differ- ent colours can b...

    Text Solution

    |

  11. Let a(n) denote the number of all n-digit numbers formed by the digits...

    Text Solution

    |

  12. Let a(n) denote the number of all n-digit numbers formed by the digits...

    Text Solution

    |

  13. Consider the set of eight vector V={a hat i+b hat j+c hat k ; a ,bc in...

    Text Solution

    |

  14. A pack contains n cards numbered from 1 to n. Two consecutive numbered...

    Text Solution

    |

  15. Let ngeq2 be integer. Take n distinct points on a circle and join each...

    Text Solution

    |

  16. Let n1<n2<n3<n4<n5 be positive integers such that n1+n2+n3+n4+n5=20...

    Text Solution

    |

  17. Let n be the number of ways in which 5 boys and 5 girls can stand in a...

    Text Solution

    |

  18. A debate club consists of 6 girls and 4 boys. A team of 4 members is t...

    Text Solution

    |

  19. How many 3xx3 matrices M with entries from {0,1,2} are there, for whic...

    Text Solution

    |

  20. Word of length 10 are formed using the letters A,B,C,D,E,F,G,H,I,J....

    Text Solution

    |

  21. In a high school, a commintee has to be formed from a group of 6 boys ...

    Text Solution

    |