Question Number: #Com2333

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?


Options:
A.) Option 1
B.) Option 2
C.) Option 3
D.) Option 4


Answer is option : D

Question Related Topics:
Quantitative Ability
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