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Let x be a least squares solution of the system Ax = b and let b be Ax. Suppose Ax = b. Which one of the following statements is ALWAYS true?
a. None of the other answers.
b. b is orthogonal to Col(A).
c. b is a vector in Col(A).
d. Nul(A) = {0}.
e. b = 0.

Sagot :

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