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The number of numbers lying in the interval (2014, 2015) where all the digits after decimal are non – zero and in increasing order is

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answer is 511.

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Detailed Solution

No. is of type 2014.1, 2014.12, 2014.123, etc. So the question involves selection of 1 or more numbers out of 1,2,........9 and arranging them in increasing order hence answer = 2⁹– 1.

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