2012 AMC 12B Problem 14


Bernardo and Silvia play the following game. An integer between 00 and 999999 inclusive is selected and given to Bernardo. Whenever Bernardo receives a number, he doubles it and passes the result to Silvia. Whenever Silvia receives a number, she adds 5050 to it and passes the result to Bernardo. The winner is the last person who produces a number less than 10001000 . Let NN be the smallest initial number that results in a win for Bernardo. What is the sum of the digits of NN ?

(A) 7(B) 8(C) 9(D) 10(E) 11\textbf{(A)}\ 7\qquad\textbf{(B)}\ 8\qquad\textbf{(C)}\ 9\qquad\textbf{(D)}\ 10\qquad\textbf{(E)}\ 11


Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.

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Problem Tags: Counting and probability

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Category: AMC 12B
Points: 3
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