If the sequence is x, x + 6, x + 18, what is the 4th value?
- 42
- 48
- 54
- None of these
Explanation
Look at how much it increases each time:
Term 1: x
Term 2: x + 6 → increased by 6
Term 3: x + 18 → increased by 12
Pattern of increases: 6, 12, ...
It goes up by 6 each time. So next increase = 18
Term 4 = Term 3 + 18 = (x + 18) + 18 = x + 36
If we take x = 18, then the terms are 18, 24, 36, 54
Last verified on 05-09-2026
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