CTET 2 Math and Science Jan 2012 Paper

Question : 32 of 120

Marks: +1, -0

How many times will I be writing 2 if I wrote down numbers from 11 to 199?

Solution:

Number of 2’s from 11 to 199

\text "no.of 2"↙{\text "__________"}

11 to 20 ––––––––> 2 times
21 to 30 ––––––––> 10 time
31 to 40 ––––––––> 1 times
41 to 110 ––––––––>7 times
111 to 120 ––––––––> 2 times
121 to 130 ––––––––> 10 times
131 to 199 ––––––––> 7 times
_______
Total = 39

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