Multiple choice

Directions: In the following question, a series is given with two terms missing. Choose the alternative that will complete the series. 20, 20, 19, 16, 17, 13, 14, 11, ?, ?

  1. 10, 10

  2. 10, 11

  3. 11, 10

  4. 13, 14

  5. 14, 16
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A Correct answer
Explanation

The series has two alternating patterns: 20, 19, 17, 14, ? (decrements of 1, 2, 3, 4) and 20, 16, 13, 11, ? (decrements of 4, 3, 2, 1). The next terms are 14-4=10 and 11-1=10.

AI explanation

The given series is actually composed of two alternating series. The first series uses the odd positions: 20, 19, 17, 14, where the differences are decreasing by 1 each time (-1, -2, -3), making the next term 14 - 4 = 10. The second series uses the even positions: 20, 16, 13, 11, where the differences are similarly decreasing by 1 (-4, -3, -2), making the next term 11 - 1 = 10. The missing pair is therefore 10, 10.

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