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A boy wanted to write the numbers from the smallest number to the greatest number of three digits. How many times he needs to press the keys of the computer to do this job?

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2978

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answer is B.

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Detailed Solution

He wants to write from 1 to 999. He has to write 9 numbers of one digit, 90 numbers of two digits and 900 numbers of three digits.

Total number of times $= 1 x 9 + 2 x 90 + 3 x 900 = 2889$

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