Multiple choice general knowledge math & puzzles 1 9 25 49 81 ? 169 100 121 88 77 Reveal answer Fill a bubble to check yourself B Correct answer Explanation The sequence consists of the squares of consecutive odd numbers: 1^2=1, 3^2=9, 5^2=25, 7^2=49, 9^2=81. The next term is 11^2=121, followed by 13^2=169. 100 is an even square, while 88 and 77 are not perfect squares.