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OpenStudy (anonymous):
The House On Your street are numbered with odd numbers starting with 1 and ending with 201. How many house numbers contain at least one 7?
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OpenStudy (aaronq):
you have 200 numbers, there is a seven in every ten numbers 1-10. so \(\sf 20\) There is also the 70's series: 70, 71, 72, 73.. 79. so the 10 more numbers, but since we already counted 77 in the previous part, we subtract 1, so \(\sf 9\). This happens again in 170's series. SO in total you have: \(\sf 20 + 9 + 9\)
OpenStudy (goformit100):
Sir/Ma'am, A Warm Welcome To Open Study.
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