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If A = [(alpha,2),(2,alpha)]and A^(3)=27...

If `A = [(alpha,2),(2,alpha)]and A^(3)=27` then `alpha = ` _________

A

`pm 2 `

B

`pm sqrt(2)`

C

`pm 1`

D

`pm sqrt(7)`

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The correct Answer is:
D
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