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JEE MATHEMATICS MCQ: PERMUTATIONS

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Analyzing +4 | -1

The number of rational numbers lying in the interval

(2002,2003)

all whose digits after the decimal points are non-zero and are in decreasing order, is

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Correct option: C

2^9-1

Option C (

2^9-1

) is correct because it represents the sum of ways to choose 1 to 9 digits from the set {1, 2, ..., 9} and arrange them in decreasing order.

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