I have this formula and need to solve for n. How do I do it since it is a factorial? Please show me, my mind is too tired to figure it out. $\displaystyle n!/{k!(n-k)!} $
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To solve for n, your expression must be equated to something else. I.e it must have an equals sign somewhere. Does this look firmiliar? $\displaystyle ^nC_k = \frac{n!}{k!(n-k)!}$
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