30 27 20 9 ? - 25
30 + 1² - 2² = 27 27 + 3² - 4² = 20 20 + 5² - 6² = 9 9 + 7² - 8² = - 6 - 6 + 9² - 10² = - 25 Alternate method: Here gap is always increasing by 4. 30 – 3 = 27 27 – 7 = 20 20 – 11 = 9 9 – 15 = – 6 –6 – 19 = – 25
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