For whole numbers n and r, the arrangements ⁿPr number… | StemPy Lab

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For whole numbers n and r, the arrangements ⁿPr number… | StemPy Lab

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For whole numbers n and r, the arrangements ⁿPr number 1680 and the selections ⁿCr number 70. What is r?

MathematicsHardHigh School (11–12)Algebra › Permutations and Combinations A-Level Board Exam IB

Created by StemPy Lab

For whole numbers $n$ and $r$ , the arrangements $^{n}P_{r}$ number $1680$ and the selections $^{n}C_{r}$ number $70$ . What is $r$ ?

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