ACT真題每日一練9.16

2015/09/16 瀏覽次數:8 收藏
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  Math Question for Wednesday, September 16th, 2015

  A vendor has 14 helium balloons for sale: 9 are yellow, 3 are red, and 2 are green. A balloon is selected at random and sold. If the balloon sold is yellow, what is the probability that the next balloon, selected at random, is also yellow?