FMO 2023 - Grade 3 - Preliminary - Paper 01 Question 10

Use the pattern to find the result of the last operation. The square and star represent operations: 1 ■ 8 ★ 5 = 4; 2 ■ 4 ★ 1 = 5; 3 ■ 9 ★ 6 = 6; 4 ■ 7 ★ 2 = ?.