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Any number between 1 and 999 can be expressed in the form of xyz where 0 < x, y, z < 9. Case 1. The numbers in which 3 occurs only once. This means that 3 is one of the digits and the remaining two digits will be any of the other 9 digits You have 199 = 81 such numbers. However, 3 could appear as the first or the second or the third digit.

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