IMO 1984 LL FRG23
A 2 imes 2 imes 12 box fixed in space is to be filled with twenty-four
IMO 1984 LL FRG23
Origin: FRG
Problem
A 2 \times 2 \times 12 box fixed in space is to be filled with twenty-four 1 \times 1 \times 2 bricks. In how many ways can this be done?