Medium
Find the missing number in the grid:
Row 1: 2, 4, 8
Row 2: 3, 9, 27
Row 3: 5, ?, 125
Explanation
Explanation
Step 1: Study Row 1: 2, 4, 8. The middle number 4 = 2², and the last number 8 = 2³.
Step 2: Study Row 2: 3, 9, 27. The middle number 9 = 3², and the last number 27 = 3³. The same rule works.
Step 3: Apply the rule to Row 3: first number 5, so the middle number = 5² = 25 and the last number = 5³ = 125 ✓ (this matches the given 125).
Answer: 25.
PRO TIP
Re-check your working by substituting the answer back into the original question.