-1, 0, 3, 8, 15, 24, 35, 48, 63, 80, x
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98
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99
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100
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101
Reveal answer
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B
Correct answer
Explanation
The differences between consecutive terms are 1, 3, 5, 7, 9, 11, 13, 15, 17 - consecutive odd numbers. The next difference is 19, so 80 + 19 = 99. Alternatively, the formula is n² - 2 for the nth term starting from n=0.
AI explanation
The differences between consecutive terms form the odd number sequence 1, 3, 5, 7, 9, 11, 13, 15, 17, increasing by 2 each time. The last known gap (63 to 80) is 17, so the next gap must be 19, giving 80+19=99.