or
or
Imagine just one face of the 5×5 cube. Which of the 1×1 cubes will have paint on only one face? Only those which are not on the edges - these will share a painted face with another side. The cubes that are not part of the edge form a 3×3 grouping of 1 cm cube.
Therefore each face has 9 cubes that are painted one color.
Since there are 6 faces we get 6×9 = 54
আপনি আমাকে যেকোনো প্রশ্ন করতে পারেন, যেমনঃ
Are you sure to start over?
