2003 AMC 10A Problem 20


A base-1010 three digit number nn is selected at random. Which of the following is closest to the probability that the base-99 representation and the base-1111 representation of nn are both three-digit numerals?

(A) 0.3(B) 0.4(C) 0.5(D) 0.6(E) 0.7\mathrm{(A) \ } 0.3\qquad \mathrm{(B) \ } 0.4\qquad \mathrm{(C) \ } 0.5\qquad \mathrm{(D) \ } 0.6\qquad \mathrm{(E) \ } 0.7

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Problem Tags: Counting and probability Number theory

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Category: AMC 10A
Points: 3
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