How many keys on a typewriter must be pressed to type the numbers from 1 to 100 without a space?
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We know, there are 9 one digit numbers, 90 two digit numbers and 1 three digit number.
Keys pressed in one digit numbers=9*1=9
Keys pressed in two digit numbers=90*2=180
Keys pressed in three digit number=1*3=3
Total number of keys pressed=9+180+3=192
Therefore, typewriter must be pressed 192 keys.
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