Line segment AB is one unit long. If point C cuts AB so that AC = 0.618, what is the ratio of AC to CB?

Since AB is 1 unit and AC is 0.618, CB = 1 − 0.618 = 0.382. The ratio AC to CB is 0.618 ÷ 0.382 ≈ 1.618, so the correct choice is 1.618.

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