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Question

How many times the digit "1" appear in numbers from 1 to 100?

A
18
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B
19
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C
20
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D
21
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Solution

The correct option is C 20
1,10,11,12,13,14,15,16,17,18,19,21,31,41,51,61,71,81,91,100

So "1" appears 20 times.

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