Multiple choice

In the following number series, two numbers have been put within brackets. Study the series carefully and select the correct alternative with respect to the series. 5, 11, 18, (25), 35, (45), 56

  1. The first bracketed number (from the left) is correct and the second is incorrect.

  2. The first bracketed number (from the left) is incorrect and the second is correct.

  3. Both the bracketed numbers are correct.

  4. Both the bracketed numbers are incorrect.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Analyze the differences: 11-5=6, 18-11=7, 25-18=7, 35-25=10, 45-35=10, 56-45=11. The pattern is differences 6, 7, 7, 10, 10, 11. The first bracketed (25) is correct, but the second (45) doesn't fit - the pattern suggests 36 not 45 (continuing 6,7,7,8,8,9 pattern). Or the increments are 6,7,7,10,10,11 - so 45 is actually correct.

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