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Number of natural numbers between 100 & 1000 such that at least one of their digits is 6, is

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Nmber of natural numbers between 100 and 1000 such that at least one of the digits is 7, is

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The number of numbers, lying between 99 and 1000 that can be made from the digits 2, 3, 7, 0, 8 and 6 when the digits occur only once in each number, is

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