Problem
2004 AMC 10B Problem 2
How many two-digit positive integers have at least one 7 as a digit?
\mathrm{(A) \ } 10 \qquad \mathrm{(B) \ } 18\qquad \mathrm{(C) \ } 19 \qquad \mathrm{(D) \ } 20\qquad \mathrm{(E) \ } 30
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