Number of natural numbers between 100 and 1000 such that at least one of their digits is 7
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Step-by-step explanation:
107,117,127,137,147,157,167,177,187,197
207,217,227,237,247,257,267,277,287,297
307,317,327,337,347,357,367,377,387,397
407....497(10 digits
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