Article: Change ringing has a peal for all

In change ringing, the aim is to play a church's set of bells in a different order each time, until all the possibilities are exhausted.

In each change, a bell may move only one place in the order. For instance, the No. 1 bell in the first change could be No. 2 in the next change, but not No. 3.

On a set of five bells, there are 120 combinations in a "peal" all of a bell set's possible permutations. With six bells it rises to 720; with seven, to 5,040. Beyond that, it becomes impractical to ring all ...

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