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Problem 18 - Entrance Test

If f(x) = (x + 1) / (x - 1), what is the value of f(f(2))?

Correct: B

f(2) = (2 + 1) / (2 - 1) = 3 / 1 = 3. f(f(2)) = f(3) = (3 + 1) / (3 - 1) = 4 / 2 = 2.