User Forum

Subject :IMO    Class : Class 3

Two guests shake hands exactly once with one another. How many handshakes are exchanged among nine guests?
(a) 36
(b) 42
(c) 35
(d) 30


Ans 1: (Master Answer)

Class : Class 1
The correct answer is A.

Ans 2:

Class : Class 7
How, please explain

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