1.

What is the ratio of the mean proportional between 8.1 and 3.6 and the third proportional of 2 and 3?

A. 5 ∶ 6
B. 5 ∶ 4
C. 6 ∶ 5
D. 4 ∶ 5
Answer» D. 4 ∶ 5


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