A) \[\frac{a}{a'}=\frac{b}{b'}=\frac{c}{c'}\]
B) \[\frac{a}{a'}+\frac{b}{b'}+\frac{c}{c'}=0\]
C) \[aa\,'+\,bb\,'+\,cc\,'+\,dd\,'=0\]
D) \[aa\,'+\,bb\,'+\,cc\,'=0\]
Correct Answer: D
Solution :
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