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Q: Which number would best complete the relation given below? 7: 64 : : 8: ?
  • A. 82
  • B. 79
  • C. 80
  • D. 81
Correct Answer: Option D - Just as, (7 × 9) + 1 = 64 Same as, (8 × 10) + 1 = 81
D. Just as, (7 × 9) + 1 = 64 Same as, (8 × 10) + 1 = 81

Explanations:

Just as, (7 × 9) + 1 = 64 Same as, (8 × 10) + 1 = 81