Which one will replace the question mark? (1 mark) [Figure description: An ellipse divided into four quadrants by a cross: top-left 1, top-right 8, bottom-left ?, bottom-right 27.]
- A. 78
- B. 64
- C. 75
- D. 84
Answer: B. 64
Explanation: Cross-difference and exponent pattern in the number square determines 64.