How many times does the digit 7 occurs if we write all the numbers from 1 to 200.

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at ones from 1 to 100= 10              (7,17,27,..........97)

at ones from 101 to 200= 10          ( 107,117,127,............197)

at tens from 1 to 100= 10      (70.....79)

at tens from 101 to 200= 10   (170......179)

Total No of 7's are

=10+10+10+10

=40

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