Are you smarter than me? 11

Algebra Level 4

Let f(x)=x+1x1f(x) = \dfrac{x+1}{x-1} for all x1x\ne 1. Which of the following is a multiple of the expression below?

f1(2)f2(3)f3(4)f4(5) f^1 (2) f^2 (3) f^3 (4) f^4(5)

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