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  4. Alok wanted to type the first 200 natural numbers. How many times does he have to press the keys?

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Q. Alok wanted to type the first 200 natural numbers. How many times does he have to press the keys?

Real Numbers

Solution:

(i) Count the number of digits appear from 1 to 200 , when written at a stretch.
(ii) For each single, double, and triple digit numbers, we have to press keys once, twice, and thrice, respectively.
(iii) There are 9 single digit, 90 double digit, and 101 triple digit numbers from 1 to 200 .