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[ (1)/(2) 1] [ 2,1,-1] is equal to...

`[ (1)/(2) 1]` [ 2,1,-1] is equal to

A

`{:[(2),(-1),(-2):}]`

B

`{:[(2,-1,-1),(-2,-1," "1),(4,2,-2):}]`

C

`[-1]`

D

not defined

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