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Let A = |(5, 5α, α), (0, α, 5α), (0, 0, 5)|. If | A^2 | = 25, then |α| equals

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Let A = |(5, 5α, α), (0, α, 5α), (0, 0, 5)|. If | A2 | = 25, then |α| equals

(a) 1/5 

(b) 5 

(c) 52 

(d) 1.

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