A basket contains 5 apples, of which 1 is spoiled and the rest are good. If Henry is to select 2 apples from the basket simultaneously and at random, what is the probability that the 2 apples selected will include the spoiled apple?
~$\frac{1}{5}$~
~$\frac{3}{10}$~
~$\frac{2}{5}$~
~$\frac{1}{2}$~
~$\frac{3}{5}$~
5个苹果随机拿两个,有10种拿法;其中一个是坏的,有4种拿法;所以概率是4/10=2/5
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