permutation
/ˌpɜ:mju:ˈteɪʃn; ˌpəmjə`teʃən/ n
(fml 文)
1 (esp mathematics 尤用於数学)
(a) [U] variation in the order of a set of things 排列; 置换.
(b) [C] any one of these arrangements 一组排列
The permutations of x, y and z are xyz, xzy, yxz, yzx, zxy, zyx. x、 y、 z的排列是xyz、 xzy、 yxz、 yzx、 zxy、 zyx.
2 (infml 口语作 perm) (Brit) (esp in football pools) selection of items from a group, to be arranged in a number of combinations （尤指足球普尔赌博中的）选定组合.