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I really need help with this( 25 points to whoever answers)

I really need help with this( 25 points to whoever answers)-example-1
User Jon Rea
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Look over all of the possible answers.  If any of them contains either M or N or both, the result is irrational.  There's one exception:  N^2 produces a rational number because the radical disappears.
User OkonX
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