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Let A=|(5,5alpha,alpha),(0,alpha,5alpha)...

Let `A=|(5,5alpha,alpha),(0,alpha,5alpha),(0,0,5)|` If `|A^2| =25` , then `|alpha|` equals :

A

`(1)/(5)`

B

`-(1)/(5)`

C

`overset""(+-)(1)/(5)`

D

Not defined

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The correct Answer is:
A
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