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In the triangle ABC, MN is parallel to A...

In the triangle ABC, MN is parallel to AB. Area of trapezium ABNM is twice the area of triangle CMN. What is ratio of CM : AM?

A

`(1)/(sqrt(3)-1)`

B

`(sqrt(3)+1)/(2)`

C

`(sqrt(3)+1)/(2)`

D

None of these

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