A) 3 : 7
B) 7 : 3
C) 21 : 10
D) 10 : 21
Correct Answer: D
Solution :
\[\frac{A}{B}\times \frac{B}{C}\times \frac{C}{D}=\frac{3}{4}\times \frac{5}{7}\times \frac{8}{9}\]\[\Rightarrow \]\[A:D=10:21\]
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