In a performance group, there are 5 men and 8 women. Among them, there are 4 married couples. If we need to choose 2 individuals – 1 man and 1 woman, what is the likelihood that one of the couples is chosen?
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Official Explanation
To determine the probability that one of the couples is chosen when selecting 1 man and 1 woman from the group, we can follow these steps:
Step 1: Determine the total number of ways to choose 1 man and 1 woman.
There are 5 men and 8 women, so the total number of ways to choose 1 man and 1 woman is:
Step 2: Determine the number of favorable outcomes where a couple is chosen.
There are 4 married couples, so there are 4 favorable ways to choose a couple.
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What it tests
Whether you can count arrangements and selections correctly — permutations vs. combinations.
Common trap
Overcounting: treating a selection as ordered when order does not matter, or forgetting to divide by duplicates.