Question

Alok wanted to type the first 170 natural numbers. How many times does he have to press the keys

Answer 1

Step-by-step explanation:

1 to 9 = 9 numbers (1 digit)

10 to 99 = 90 numbers (2 digits)

100 to 170 = 71 numbers (3 digits)

Total Digits = (9×1)+(90×2)+(71×3) = 9+180+213 = 402 DIGITS

Hence , he would press the keys 402 times.

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