Directions for Questions - A solid cube has been painted yellow, blue and black on pairs of opposite faces. The cube is then cut into 36 smaller cubes such that 32 cubes are of same size while 4 others are of bigger size. Also no face of any of the bigger cubes is painted blue. Give the correct answer by choosing correct alternative.   |
A) 20
B) 16
C) 12
D) 8
Correct Answer: A
Solution :
Eight cubes in each of the first and the third layers and all the four cubes in the second layer have at least one of their faces painted black. Such cubes are \[\left( 8\times 2 \right)+4=20.\]
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