Question
Find the wrong number in the given number series.
4, 11, 25, 53, 109, 223, 445Solution
Check the pattern: 4 → 11: 4 × 2 + 3 = 11 11 → 25: 11 × 2 + 3 = 25 25 → 53: 25 × 2 + 3 = 53 53 → 109: 53 × 2 + 3 = 109 109 → ? : 109 × 2 + 3 = 221 221 → 445: 221 × 2 + 3 = 445 So the correct series should be: 4, 11, 25, 53, 109, 221, 445 Given term 223 breaks this pattern. Hence, 223 is the wrong number.
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