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How many numbers are there between 99 and 1000 having 7 in the unit’s place? 

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First note that all these numbers have three digits. 7 is in the 10 digits from 0 to 9. The digit in hundred’s place can be any one of the 9 digits from 1 to 9. Therefore, by the fundamental principle of counting, there are 10 × 9 = 90 numbers between 99 and 1000 having 7 in the unit’s place.

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