Suppose there are 100 students in your accounting class, 10 of whom are left-handed. Two students are selected at random.
What is the probability of the following events?
a. Both are right-handed.
b. One is right-handed and the other is left-handed.
ans. (a) .8091
(b) .1818
我算出來的答案是 0.81 及 0.18 但正解卻是四位小數，想要問是如何求出的?
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