The following figure consists of twenty-seven cubes. How many cubes will get closed on all sides by other cubes ?

A 1
B 3
C 6
D 9

Correct Answer: 1

Let's there are 27 small cubes consist a big cube. Each side of big cube shows 9 cubes which are connected to each other. Put the big cube at a stable position. Now it shows ●upper side 9 cubes, ● lower side 9 cube ●middle part 8 cube Total no. of visible cube 9 + 9 + 8 = 26 So, invisible cube is 27 - 26 = 1 Here Invisible cube means that all side of which cube are closed to another cube.
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