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2013年01月25 SAT官方每日一题
考试类型: Mathematics > Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
A jar contains only red marbles and green marbles. If a marble is selected at random from the jar, the probability that a red marble will be selected is 
. If there are 
green marbles in the jar, how many red marbles are there in the jar?
A. 
B. 
C. 
D. 
E. 
