Discussion

Explanation:

Exactly two faces colored will come from edges.
4 edges of blue and red with 3 cubes from each edge, i.e., total 4 × 3 = 12 cubes.
4 edges of red and yellow with 1 cube from each edge, i.e., total 4 × 1 = 4 cubes.
4 edges of yellow and blue with 2 cubes from each edge, i.e., total 4 × 2 = 8 cubes.

∴ Total = 12 + 4 + 8 = 24 cubes will have exactly two faces colored.

Hence, option (b).

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