Multiple choice

In which of the following series is the value of Y incorrectly placed? Series I: 5, 10, Y, 29, 43, 60 Series II: 72, Y, 20, 81, 1297 Series III: 7, 12, Y, 25, 33, 42 Given value of Y is 18.

  1. Only I and III

  2. Only III

  3. Only I

  4. Only II

  5. None of these
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D Correct answer
AI explanation

In the first series, the differences between consecutive terms are 5, 8, 11, 14, and 17, making 18 the correct third term (5 + 8 + 5). In the second series, the pattern is (previous term minus 6) multiplied by increasing consecutive integers, which gives (72 - 6) * 1 = 66, making 18 incorrectly placed. In the third series, the differences between consecutive terms are 5, 6, 7, 8, and 9, making 18 the correct third term (7 + 5 + 6). Therefore, the value of 18 is incorrectly placed only in Series II.

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