Permutations & Combinations
Counting Geometric Configurations
Grade 11
Question:
<p>The number of ways of selecting two parallel lines from the edges and face diagonals of a cube is equal to</p>
Step-by-Step Solution
Key Concept: Identify parallel pairs among edges and face diagonals of a cube
<p>A cube has 12 edges and 12 face diagonals. Parallel lines among these must be matched. The number of ways to select two parallel lines from edges and face diagonals is 18.</p>
Correct Answer: P