【GMAT考满分数学PS题库】A box contains b blue balls and r_真题_答案

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A box contains b blue balls and r red balls. If 4 blue balls and 3 red balls are added to the box, and if one ball is obtained at random from the box, then the probability that a blue ball is obtained can be represented by

A
$\frac{b}{r}$
B
$\frac{b}{b + r}$
C
$\frac{b + 4}{r + 3}$
D
$\frac{b + 4}{b + r + 4}$
E
$\frac{b + 4}{b + r + 7}$

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正确答案: E

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