Multiple choice

Find the missing number (?) in the following series: 1, 1.5, 2.5, 4, ?, 8.5, 11.5, ...

  1. 6

  2. 5

  3. 4.5

  4. 5.5
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A Correct answer
Explanation

Differences between consecutive terms: 0.5, 1.0, 1.5, ?, ?, 3.0, 3.0. The pattern of differences is 0.5, 1.0, 1.5, 2.0, 2.5, 3.0. So 4 + 2.0 = 6.

AI explanation

The differences between the consecutive terms are increasing by 0.5, as seen in the additions of 0.5, 1.0, and 1.5. Continuing this additive pattern, the next difference must be 2.0, making the missing term 4 plus 2, which is 6. This is verified by the subsequent addition of 2.5 to reach 8.5.

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