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nick Gupta from sky world , Panchkula

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)

Admin from revisewise, Noida

Class : Class 1

The correct answer is A.

Ashmita Bose from Nalanda Public School, Kandivali Mumbai

Class : Class 8

How, please explain