Question

Each edge of a cube is coloured either red or
black. If every face of the cube has at least one
red edge, then the smallest possible number of
red edges is:

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Answer 1

There are 6 faces. Each face has 4 edges but not unique edges since edges are shared with one other face. 6*4=24 24/2=12 unique edges. So at least one of four edges is black. Each black edge is shared. So we need at least 3 black edges to have all faces with a black edge. 12/4=3 .....

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Answer 2

Answer:

number of red is 3.

Step-by-step explanation: