Multiple choice general knowledge math & puzzles 6-7-7-9-18-21-63-? 76 252 67 96 7 Reveal answer Fill a bubble to check yourself C Correct answer Explanation The pattern alternates between adding and multiplying with increasing numbers: +1, ×1, +2, ×2, +3, ×3, +4. Following this sequence, 63 + 4 = 67. The operations increase by 1 each time while alternating between addition and multiplication.