Multiple choice

Directions: Find the missing term in the following number series. 18, 20, 15, 17, 12, 14, ___.

  1. 9

  2. 7

  3. 5

  4. 8
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A Correct answer
Explanation

The pattern is +2, -5, +2, -5, +2, -5. 18+2=20, 20-5=15, 15+2=17, 17-5=12, 12+2=14, 14-5=9.

AI explanation

This series is formed by interleaving two separate sequences, where the first sequence is 18, 15, 12 and the second is 20, 17, 14. In the first sequence, we subtract 3 each time to get the next term (18 - 3 = 15 and 15 - 3 = 12). Following this alternating sequence method, the next term belongs to the first sequence, calculated as 12 - 3 = 9. The result is 9.

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