Traditional Culture Encyclopedia - Photography major - Photography five people
Photography five people
Knowing from the meaning of the question that this problem is a step-by-step counting problem,
First, two people were selected from the nine people in the back row, and there were C 9 2 kinds of results.
Then arrange two people in one of the seven positions, with a 7 2,
∴ Different adjustment methods are C 9 2 A 7 2,
So choose C.
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