Question: Let A = {a, b, c, d}. 1. Find all combinatorial lines in A2. How many combinatorial lines are there? 2. Let n E

Let A = {a, b, c, d}. 1. Find all combinatorial lines

Let A = {a, b, c, d}. 1. Find all combinatorial lines in A2. How many combinatorial lines are there? 2. Let n E N. Prove that the number of combinatorial lines in A" equals 5" 4".

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