Question

How many key-strokes are needed to type numbers from 1 to 1000?

Answer 1

Each of these numbers requires 3 keystrokes. Therefore, one requires2700 keystrokes to type these 3 digit numbers. Then 1000 is a four-digit number which requires 4 keystrokes. Totally, therefore, one requires 9 + 180+ 2700 + 4 = 2893 keystrokes

Answer 2

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⎇ 1000 is a four-digit number which requires 4 keystrokes. Totally, therefore, one requires 9 + 180+ 2700 + 4 = 2893 keystrokes