Calculate this mentally and improve your thinking power.
Katy wrote all the numbers from 200 to 300 on a piece of paper.
How many times did she write the digit 2?
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The number of times 2 will appear in hundreds place: (200 to 299) is 100
The number of times 2 will appear in tens place: (220 to 229) is 10
The number of times 2 will appear in units place: (202, 212, 222 ….292) is 10
So she will write the digit 2 120 times.
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There are 101 numbers from 200 to 300, inclusive. The last one, 300, has no ‘2’. The other 100 numbers have form 2MN, with M, N being any digit. There are 100 ‘2’ in the first position {2MN}, 10 in the second position {22N}, and 10 in the last position {2M2}. Thus, the total is 120 ‘2’ digits will be written.
Of course, if she wrote it all in binary, none of the digits will be ‘2’.
121 times.
119 from reading and 0 from logic any one from this two options