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each of following equivalent to sqrt(800mn) EXCEPT

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If m and n are positive integers, each of the following could be equivalent to sqrt(800mn) EXCEPT
80sqrt(m.)
40sqrt(10m.)
40m x sqrt(5.)
20sqrt(5m.)
20sqrt(2m.)

OE
[Reveal] Spoiler:
Attachment:
OE.png


Hi, I want to know if this OE is the best way to solve this question, please.

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