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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

Adding four of the five fractions $\frac{1}{2}$ , $\frac{1}{3}$ , $\frac{1}{6}$ , $\frac{1}{9}$ and $\frac{1}{18}$ gives a total of $1$ . Which of the fractions is not used?

(A) $\frac{1}{2}$ (B) $\frac{1}{3}$ (C) $\frac{1}{6}$ (D) $\frac{1}{9}$ (E) $\frac{1}{18}$

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