Home
Class 12
MATHS
A three digit number n is such that...

A three digit number n is such that the last two digits of it are equal and different from the first , the number of such n's is

A

64

B

72

C

81

D

900

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • PERMUTATIONS & COMBINATIONS

    DIPTI PUBLICATION ( AP EAMET)|Exercise EXERCISE 1B (COMBINATIONS )|222 Videos

  • PERMUTATIONS & COMBINATIONS

    DIPTI PUBLICATION ( AP EAMET)|Exercise EXERCISE 2 ( SPECIAL TYPE QUESTIONS ) SET -1|9 Videos

  • PERMUTATIONS & COMBINATIONS

    DIPTI PUBLICATION ( AP EAMET)|Exercise EXERCISE 2 ( SPECIAL TYPE QUESTIONS ) SET -4|10 Videos

  • PARTIAL FRACTIONS

    DIPTI PUBLICATION ( AP EAMET)|Exercise EXERCISE 2 SET - 4|2 Videos

  • PROBABILITY

    DIPTI PUBLICATION ( AP EAMET)|Exercise EXERCISE 2 (SPECIAL TYPE QUESTIONS) SET-4|5 Videos

Similar Questions

Explore conceptually related problems

The total number of seven digit numbers so that the sum of digits is even is

How many three digit number can be formed using digits 1-9 no digits are repeating?

In a two digit number the sum of the two digits is 8. If 18 is added to the number its digits are reversed. Find the number.

The form of a two - digit number?

Sum of all three digit number ( no digits being zero ) having the property that all digits are perfect squares , is

A two digit number is such that the product of its digits, is 8. When 18 is added to the number, they interchange their places. Determine the number.

The number of three digit numbers in which 9 appears only in one place is

DIPTI PUBLICATION ( AP EAMET)-PERMUTATIONS & COMBINATIONS-EXERCISE 1A (PERMUTATIONS )
  1. An n- digit number is a positive number with exctly n digits ...

    Text Solution

    |

  2. The number of quadratic expressions with the coefficients drawn ...

    Text Solution

    |

  3. A three digit number n is such that the last two digits of it ...

    Text Solution

    |

  4. Eight different letters of an alphabet are given . Words of f...

    Text Solution

    |

  5. ten different letters of alphabet are given . Words with 5 lett...

    Text Solution

    |

  6. The number of four letter words using the letters of the word ...

    Text Solution

    |

  7. The number of 4 letter words that can be formed with the letters in th...

    Text Solution

    |

  8. The number of four digits telephone numbers having atleast one ...

    Text Solution

    |

  9. The number of number between 1 and 10 ^(10) which contain the d...

    Text Solution

    |

  10. The number of three digits number of the form xyz with x lt y, z...

    Text Solution

    |

  11. A telegraph post has 5 arms . Each arm is capable of four disti...

    Text Solution

    |

  12. There are 3 candidates for a professorship and one is to electe...

    Text Solution

    |

  13. A guardian with 5 wards wishes everyone of them to study eith...

    Text Solution

    |

  14. 3 letters are to be posted in 5 letter boxes in a part of the ...

    Text Solution

    |

  15. Each of the five questions in a multiple choice test has 4 p...

    Text Solution

    |

  16. The number of ways in which 7 distinct toys can be distributed ...

    Text Solution

    |

  17. The number of ways that five prizes can be given to 4 boys , wh...

    Text Solution

    |

  18. The number of ways in which 10 letters can be posted in 5 letter boxe...

    Text Solution

    |

  19. The number of ways of wearing 6 different rings to 5 hands is

    Text Solution

    |

  20. The number of functions that can be defined from a set containi...

    Text Solution

    |