Problem 15 · 2018 Math Kangaroo
Hard
Spatial & Visual Reasoning
net-foldingdice-faces
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Answer: E
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Hint 1 of 2
Fold each net mentally and check the three pairs of opposite faces.
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Hint 2 of 2
A valid die needs every opposite pair to be two different colours; find the net where some opposite pair matches.
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Approach: fold each net and test opposite faces
- When folded, each net's faces pair up into three opposite pairs.
- The rule says opposite faces must be different colours.
- Four of the nets fold to dice obeying this; in net E a pair of opposite faces ends up the same colour.
- So net E cannot be such a die.
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