Multiple choice general knowledge math & puzzles 7 8 49 64....................... 512 113 143 223 343 Reveal answer Fill a bubble to check yourself D Correct answer Explanation The sequence consists of pairs where the second number is the square or cube of the first, or simply powers. 7, 8, 7^2(49), 8^2(64), 7^3(343), 8^3(512). The missing number is 7 cubed, which is 343.