Answer the question based on the information given below:
Let S be the set of all pairs (i, j) where, 1 ≤ i < j ≤ n and n≥4. Any two distinct members of S are called “friends” if they have one constituent of the pairs in common and “enemies” otherwise. For example, if n = 4, then S = {(1, 2), (1, 3), (1, 4), (2, 3), (2, 4), (3, 4)}. Here, (1, 2) and (1, 3) are friends, (1, 2) and (2, 3) are also friends, but (1, 4) and (2, 3) are enemies.
Question: For general ‘n’, consider any two members of S that are friends. How many other members of S will
be common friends of both these members?