18, 21, 25, 18, 29, 33, 18, ____, _____?
- 43, 18
- 37, 18
- 37, 41
- None of these
Explanation
Sequence: 18, 21, 25, 18, 29, 33, 18, ?, ?
Notice 18 repeats every 3rd number: positions 1, 4, 7 → next 18 should appear at position 10.
Look at the numbers between 18s:
21 → 25 → difference = +4
29 → 33 → difference = +4
So the pattern between 18s is: start number, +4 → next number, then 18 appears.
Applying this to the next numbers after 18 (position 7):
18 → next = 37 (since previous +4 pattern continued)
next after 37 = 41
Sequence becomes: 18, 21, 25, 18, 29, 33, 18, 37, 41, 18
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