What should come in place of the question mark (?) in the given series? 18 24 12 30 ? 36
6
Examine alternate terms: 18, 12, ? → differences. And 24, 30, 36 differ by +6 each time.
First group (positions 1,3,5): 18, 12, ? Pattern: 18→12 is −6; 12→? is −6 → ? = 6.
Second group (positions 2,4,6): 24, 30, 36 with +6 each time ✓.
The correct answer is : 6.
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Important Questions from Series
Choose the option which completes the given figure series.
Select the correct option that will fill in the blank and complete the series.
18, 36, 108, 432, 2160, .............Select the correct option that will fill in the blank and complete the series.
52, 56, 65, 81, 106, ?Select the correct option that will fill in the blank and complete the series. 21, 43, 85, 171, 341, .......
Select the correct option that will fill in the blank and complete the series.
3, 5, 7, 9, 11, ?
2, 2, 2, 2, 2, ?
