Happy Friendship Day

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As it was "Friendship Day" two days ago. I had come to know about a theorem known as "Friendship Theorem."

Let's see what does it says?

The “Friendship Theorem” states that, in a party of n persons, if every pair of persons has exactly one common friend, then there is someone in the party who is everyone else's friend.

Further one can also get a "Friendship Graph."

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