Question
30 27 20 9 ? -
25 What should come in place of the question mark (?) in the following number series?Solution
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
More Series Questions
562, 628, 698, ?, 850
40   41    37   46    ?      55    19
...10, 15, 25, 35, ?, 65
168, 178, ?, 273, 400, 618, 963
120, 130, 145, 165, ?, 220
16.12 × 15.94 + 654.92 – 344.83 = ?× 5.95
What will come in place of the question mark (?) in the following series?
121, 110, 97, ?, 61, 38
11   6   7   12   26    ?    205.5
- What will come in place of (?), in the given number series.
1, 4, 9, 16, ?, 36 98, 122, 182, 278, 410, ?
