How many different rectangular prisms can be built using 18 unit cubes?

Answer 1

To find the number of different rectangular prisms that can be built using 18 unit cubes, we need to determine the possible dimensions ( (l, w, h) ) such that ( l \times w \times h = 18 ), where ( l ), ( w ), and ( h ) are positive integers. The factor combinations of 18 are: ( (1, 1, 18) ), ( (1, 2, 9) ), ( (1, 3, 6) ), ( (2, 3, 3) ), and their permutations. Counting unique arrangements, there are a total of 6 distinct rectangular prisms that can be formed.