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Question: a row has 12 chairs seven people arrive and they...

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A row has 12 chairs. Seven people arrive and they have to choose 7 chairs to sit. In how many ways can these people be seated? a. 792 b. 3,991,680 Oc, 84 d.5040 e. 479,001,600
A company has 9 engineers. The company has a major project that has been divided into 3 subprojects. Three engineers are assigned to each subproject. In how many ways can this be done? Oa. 243 b. 1680 C.13440 o d. 648 e. 1120
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