首先，你应该知道45是如何得出的。那就是利用排列和组合。
由于长方体与正方体的边数相同，因此它们应该有相同的答案。所以答案是 45。
但了解 45 是如何得出的很重要。
First, you should know how 45 is derived. That is by the use of permutation and combination.
Since a cuboid has the same number of sides as a cube, they should have the same answer. So the answer is 45.
But it is important to learn how the 45 is derived.
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首先，你应该知道45是如何得出的。那就是利用排列和组合。
由于长方体与正方体的边数相同，因此它们应该有相同的答案。所以答案是 45。
但了解 45 是如何得出的很重要。
First, you should know how 45 is derived. That is by the use of permutation and combination.
Since a cuboid has the same number of sides as a cube, they should have the same answer. So the answer is 45.
But it is important to learn how the 45 is derived.