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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

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The correct Answer is:
C
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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-EXERCISE-II
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  11. A is a set containing n elements. A subset P of A is chosen. The set A...

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  12. A is a set containing n elements. A subset P of A is chosen. The set A...

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  17. Match the following {:("List-I","List-II"),((I)""^(n)C(r+1)+2""^(n)C...

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