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If A=1/3{:[(1,2,2),(2,1,-2),(a,2,b)]:} i...

If `A=1/3{:[(1,2,2),(2,1,-2),(a,2,b)]:}` is an orthogonal matrix, then

A

a = – 2, b = – 1

B

a = 2, b = 1

C

a = 2, b = – 1

D

a = – 2, b = 1

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