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Groups and FieldsMediumPermutation Groups

Permutation Groups · Medium problem

A permutation π∈S7\pi \in S_7 sends 1,2,3,4,5,6,71,2,3,4,5,6,7 to 2,1,4,5,3,7,62,1,4,5,3,7,6 respectively. What is the order of π\pi?