HKIMO 2026 Grade 5 National Final (Heat) Set 05 Question 24

Arrange the five letters A, B, C, D, E in a row. If C and E must be adjacent in either order, how many permutations are possible?

Source glossary (English–Vietnamese): Arrange: sắp xếp; Adjacent: cạnh nhau; Permutations: cách xếp.