Probability of college entrance examination; If three of the four delegates are chosen as delegates, what is the probability that A is chosen? - Training Enrollment Network

Probability of college entrance examination; If three of the four delegates are chosen as delegates, what is the probability that A is chosen?

Choose three out of four people, and there are four possibilities: c (4 4,3) =,

There are three options for A: C (1,1) * c (3,2) =1* 3 = 3.

So the probability is 3/4.

You can also think of it this way: from the four candidates, it is determined that 1 person will not be elected, and the probability is 1/4.

So the probability of everyone being elected is 1- 1/4=3/4.

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