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Additive Identity

How many time...

Question

How many times the digit $" 1 "$ appear in numbers from $1 t o 100 ?$

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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