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If P = {1, 2}form the set P xxP xxP....

If `P = {1, 2}`form the set `P xxP xxP`.

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`P ={1,2}`
`P*P = {1,2}*{1,2}`
`= {(1,1),(1,2),(2,4),(2,2)}`
multiplying by P again
`P*P*P = {(1,2)},{(1,1),(1,2),(2,1),(2,2)}`
`= {(1,1,1),(1,1,2),(1,2,1),(1,2,2),(2,1,1),(2,1,2),(2,2,1),(2,2,2)}`
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