Numbers between 100 and 1000 which do not have at least one digit as4
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Numbers between 100 and 1000=900
Numbers between 100 and 1000 which do not have digit 7 at any place =8×9×9=648
Therefore,
Numbers between 100 and 1000 which have at least one digit as 7=900−648=252
Hence there are 252 numbers in between 100 and 1000 such that at least one of their digit is 7.
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