Problem Solving
试题详情
题目：
A gumball dispenser has 24 gumballs, 12 white and 12 black, which are dispensed at random. If the first 3 gumballs dispensed are black, what is the probability that the next gumball dispensed will be black?
选项:
A、
B、
C、
D、
E、
答案:
D
