A group of 10 students participate in chess club, karate club, or neither.
1 answer:
Answer: Option B

Step-by-step explanation:
We look for the conditional probability of A given B.
This is written as:

First we must find the probability of A and B
There are 10 students in total. Note that of those 10 students only 2 of them are at the same time in the karate club and in the chess club
Therefore:

There are 10 students in total. Note that of those 10 students only 4 of them are in the chess club
Then:

Finally:

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