A website Maths Puzzle Logical Reasoning

Sarah has 17 cousins and 3 sisters. If she and her sisters want to take 4 other boys to the dance, in how many ways can they be paired up in boy-girl pairs?

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17 is irrelevant. Number of ways 4 boys and 4 girls can be paired up is 4! pr (4)(3)(2)(1) = 24 ways
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