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The correct tree diagram for the probability \( P(\text{ННУ}) = q^2 p \) represents two consecutive occurrences of "Н" (with probability \( q \)) followed by one occurrence of "У" (with probability \( p \)).

Looking at the tree diagrams:

• Find the one that shows two paths marked "Н" followed by one path marked "У".
• Ensure these branches are connected in sequence.

Review the diagram, focusing on the sequence of events, to identify the correct representation.