How many numbers are there between 99 and 1000 having at least one of their digits 7
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99 ...... 1000
Numbers with at least one digit = 7 ?
107, 117, 127 ... 167, 170, 171, .. 179, 187, 197..
:
907 , 917, 927, ... 967, 970, 971, ...979, 987, 997
So there are 10 + 9 for each century.
Hence there are : 9 * 19 = 171
Numbers with at least one digit = 7 ?
107, 117, 127 ... 167, 170, 171, .. 179, 187, 197..
:
907 , 917, 927, ... 967, 970, 971, ...979, 987, 997
So there are 10 + 9 for each century.
Hence there are : 9 * 19 = 171
kvnmurty:
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