Instructions
These questions are based on the following information.
A cube of 7cm × 7cm × 7cm is kept in the corner of a room and painted in three different colours, each face in one colour. The cube is cut into 343 smaller but identical cubes.
Solution
Three faces are painted as given in the figure.
Total number of cubes= 343
Total number of painted cubes=7x7+7x6+6x6=49+42+36=127
Number of cubes which are colourless = 343-127=216
Option D
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