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How many numbers are there between 100 and 1000 such that at least one of their digits is 7 ?How many numbers are there between 100 and 1000 which have

exactly one of their digits as 7? pls explain the meaning of least and exactly.


107,117,127,137,147,157,167,170,171,172,173,174,175,176,177,178,179,187,197.......and so on
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