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Required numbers from 200 and 300 are 207,217,227,237,247,257,267,270,271,272,273,274,275,276,278,279,287,297 these are the numbers

therefore, the answer is 18

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Q: How many numbers are there between 200 and 300 in which 7 occurs only once?
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1. The numbers 1 through 99 are 99 different numbers; each one occurs once.


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