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Linear Algebra

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Could not Appear LC

LINALG-SKCWNX

Which of the following could not appear as terms in an expression that was a linear combination of $a$ and $b$?

Select ALL that apply.

A

$1/a$

B

$a/\sqrt 2$

C

$ab$

D

$\sqrt{b}$

E

$\cfrac{a+b}{3}$