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The difference between successive numbers increases by 2 at each step.

1.5 → 5 : 3.5

5 → 10.5 : 5.5

10.5 → 18 : 7.5

The next difference is thus 9.5.

And the next number in the sequence is: 18 + 9.5 = 27.5

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14y ago
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Q: The number which best completes the sequence below is 1 .5 5 10.5 18?
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