exam Maths Puzzle Numerical Ability

Pls help me with this qn: One thousand cubes are arranged to form a large cube. All the surfaces of the large cubes are then painted. What fraction of the cubes are not painted at all?

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exam Other Question
Determine the equation of the axis of symmetry for the parabola whose x - intercepts are (-3, 0) and (1,0). Solve the system by using the addition method. -0.1x+0.05y=5 and 0.05x+0.06y=2.7 What is x?