$\begin {array} {1 1} (A)\;\large\frac{1}{6} & \quad (B)\;\large\frac{1}{36} \\ (C)\;\large\frac{1}{18} & \quad (D)\;\large\frac{3}{28} \end {array}$

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so (1,2,3) is same as (3,2,1) so answer should be 3/28