2006 Romanian NMO Problems/Grade 8/Problem 3

Problem

Let $ABCDA_1B_1C_1D_1$ be a cube and $P$ a variable point on the side $[AB]$ . The perpendicular plane on $AB$ which passes through $P$ intersects the line $AC'$ in $Q$ . Let $M$ and $N$ be the midpoints of the segments $A'P$ and $BQ$ respectively.

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2006 Romanian NMO Problems/Grade 8/Problem 3

Problem

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