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option d.) is given correct

similar problem to Nourage's.
look up the "handshake problem"

:D

that problem is easy this question has twists

did i do any mistake out there? ^

so, 15 people

wait i got my mistake :)

\[\left(\begin{matrix}n \\ 2\end{matrix}\right)+9=75\]solve for n

@UnkleRhaukus please help

here we are given that each participant was to play one match against each one participant

and let we consider participants 1,2,3,4,5,6,7etc we have to find the pairs

hey got my point or not ?

like we are given set {1,2,3,4,5,6} so we are asked that find the number of order pairs ..

it looks like i'm talking to myself ..