It is given that X1 X2 XM are M non-zero orthogonal...

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It is given that X₁, X₂, ... X_M are M non-zero, orthogonal vectors. The dimension of the vector space spanned by the 2M vectors X₁, X₂ ... X_M, -X₁, -X₂ ... -X_M is

A. 2M

B. M + 1

C. M

D. dependent on the choice of X₁, X₂, ... X_M

Answer: Option C

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