请帮忙 解释以下的问题: addition, special, 的, applies, standard

miokong

请帮忙 解释以下的问题:

The special rule of addition applies when calculating the probability that the first card chosen in a standard deck of cards will be
A. a heart or a queen
B. a heart or a spade
C. a heart and a queen 

[此贴子已经被作者于2010-7-25 20:55:17编辑过]

miokong

请帮忙 解释以下的问题:

The special rule of addition applies when calculating the probability that the first card chosen in a standard deck of cards will be
A. a heart or a queen
B. a heart or a spade
C. a heart and a queen

[此贴子已经被作者于2010-7-25 20:54:38编辑过]

miokong

 请问有人可以帮忙吗?