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Algebra 13 Online
OpenStudy (anonymous):

The houses on your street are numbered with odd numbers starting with 1 and ending with 201. How many house numbers contain at least one 7?

OpenStudy (anonymous):

1 3 5 7 9 = 1 11 13 15 17 19 = 1 now when we get to 70 -80 there is 71 73 75 77 79 = 5 same for the 170 - 180

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