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Fundamental Principle of Counting

A three digit...

Question

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

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B

72

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C

81

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D

900

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Solution

The correct option is C 81
The first digit place can be filled in 9 ways.
The second third digit place can be filled in 9 ways.
Requi9red number of ways $= 9 \times 9 = 81$

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