math
There are 4 pieces of paper, numbered 10 to 13, in a hat. After another numbered piece of paper is added, the probability of picking a number between 10 and 13 inclusive is 4/5. Which of the following numbers could be the number on the new piece of paper?
A. 10
B. 11
C. 12
D. 13
E. 1
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Chen Sam
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