Twenty switches in an office computer network are to be connected so that each switch has a direct connection to exactly three other switches. How many connections will be necessary?

Please answer fast!!

Guest Jun 12, 2019

#1**+3 **

Each switch has 3 connections so there are 3* 20 = 60 connections, but that counts each connection twice (connecting A to B is the same as connecting B to A) so divide 60 by 2 to get 30 connections.

power27 Jun 13, 2019