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Which of the following series has/have no wrong term?

(1) 2, 5, 10, 17, 26, 37
(2) 2,9, 28, 65, 126, 217
(3) 0, 3, 8, 15, 24, 37
(4) 0,7, 29, 64, 124, 215​

User Dmarin
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1 Answer

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Final answer:

After analyzing the patterns, it can be concluded that Series 1 and Series 2 have no wrong terms since they follow the patterns of consecutive odd numbers and cubes minus one, respectively. Series 3 and Series 4 have incorrect terms, with Series 3 breaking the square pattern and Series 4 having an incorrect term when following the cube pattern.

Step-by-step explanation:

To determine which series has no wrong term, we need to understand the underlying pattern or the rule that governs each series. The sequences given in the question can be patterns of any mathematical relationships like arithmetic sequences, geometric sequences, cubes, squares, or any other algebraic relation.

For the given sequences:

  1. Series 1: 2, 5, 10, 17, 26, 37 - This seems to be an arithmetic series where each term is an increment of the previous term by consecutive odd numbers (3, 5, 7, 9, 11). This series has no wrong term as each term fits the pattern correctly.
  2. Series 2: 2, 9, 28, 65, 126, 217 - This series appears to be based on cubes, where each term is one less than a perfect cube (3^3 - 1, 4^3 - 1, 5^3 - 1, 6^3 - 1, 7^3 - 1, 8^3 - 1). Again, there is no wrong term in this series as per the pattern.
  3. Series 3: 0, 3, 8, 15, 24, 37 - This series resembles the squares, where each term after the first is a square of a natural number (1, 2, 3, 4) increased by one (1^2+1=2, 2^2+1=5, 3^2+1=10, 4^2+1=17), except the last number which breaks the pattern. Thus, the term 37 is incorrect as we would expect 5^2+1=26.
  4. Series 4: 0, 7, 29, 64, 124, 215 - Similar to Series 2, this looks like the pattern of one less than perfect cubes, but the correct term after 64 would be 125 (5^3) rather than 124. Therefore, 124 is the wrong term in this series.

Based on this analysis, Series 1 and 2 have no wrong term, and thus are the correct answers.

User Caleb Denio
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