Observe the pattern for each triangle. Use the formula: Top Left × Top Right + Bottom = Middle First triangle: 3 × 2 + 4 = 6 + 4 = 10 Second triangle: 6 × 5 + 7 = 30 + 7 = 37 So, middle number is 37 Third triangle: 9 × 8 + 10 = 72 + 10 = 82 Hence, the missing number is 37