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9 September, 18:25

What is the value of 7P3? A. 21 B. 35 C. 210 D. 840

i think a but idk

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  1. 9 September, 19:00
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    The answer is C.

    Here's why, nPr = n! / (n-r) !. Plug in 7 for n and 3 for r. And you get 7! / (7-3) !.

    Thus, 7!/4! = (7*6*5*4*3*2*1) / (4*3*2*1), which simplifies to 7*6*5 = 210
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