How many times will the keys of a typewriter be used, if one starts typing from 1 to 1000?
2891 strokes
2893 strokes
2721 strokes
2793 strokes
Solution
From 1 to 9 the keys are used 9 times.
From 10 to 99, there are 90 numbers = 180 strokes
From 100 to 999, there are 900 numbers = 2700 strokes
For 1000 there are 4 strokes
Total =2893 strokes