11. If we write all the whole numbers from 200 to 400 then how many of these contain the digit 7 once and only once?
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we will get 7 hundred and ten times
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Required numbers from 200 to 300 are 207,217,227,237,247,257,267,270,271,272,273,274,275,276,278,279,297
Position of 7 will be same in numbers between 300 to 400
Therefore, Total number of such numbers = 18 + 18 = 36
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