Multiple choice

Find the wrong one in the series 125, 127, 130, 135, 142, 153, 165

  1. 130

  2. 142

  3. 153

  4. 165
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D Correct answer
Explanation

Find the differences between consecutive terms: 127-125=2, 130-127=3, 135-130=5, 142-135=7, 153-142=11, 165-153=12. The pattern of differences is 2, 3, 5, 7, 11, 12, which should be consecutive prime numbers (2, 3, 5, 7, 11, 13). The difference 12 (for 165) breaks this pattern - it should be 13.

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