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jmc

counting and probability junior

Problem

James has 7 apples. 4 of them are red, and 3 of them are green. If he chooses 2 apples at random, what is the probability that both the apples he chooses are green?
Solution
There are total ways for James to choose 2 apples from 7, but only ways for him to choose 2 green apples. So, the probability that he chooses 2 green apples is .
Final answer
\frac{1}{7}