Question 26

How many times the keys of a typewriter have to be pressed in order to write numbers from 121 to 1346?

Solution

Total numbers between 121 to 999

= $$999-121+1=879$$

Since, these are 3 digit numbers, thus to type each number key is pressed 3 times

Thus, keys pressed while writing numbers from 121 to 999 = $$879\times3=2637$$

Similarly, numbers between 1000 to 1346

= $$1346-1000+1=347$$

Keys pressed = $$347\times4=1388$$

$$\therefore$$ Total times the keys are pressed = $$2637+1388=4025$$

=> Ans - (D)

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