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?
(A) 1/5
(B) 3/10
(C) 2/5
(D) 1/2
(E) 3/5
答案是C.
怎么解不出来是2/5？ 请高手帮忙！多谢 | 
