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QUESTION
Suppose the n -vectors a , b , and c satisfy a c and b c . Which of the following statements must hold?
Suppose the n -vectors a , b , and c satisfy a⊥c and b⊥c . Which of the following statements must hold? (That is, are true for any a, b and c that satisfy conditions.)
- a⊥b
- (a+b)⊥c
- (a+c)⊥(b+c)
