Multiple choice

Find the wrong number in the following number series- $3, 7, 14, 55, 274, 1643$

  1. $7$
  2. $14$
  3. $55$
  4. $1643$
  5. $274$
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A Correct answer
Explanation

Test the pattern from 7 onward: 7 × 2 + 0 = 14 (should be 7 × 2 + 1 = 15). If we use 15: 15 × 4 - 5 = 55, 55 × 5 - 1 = 274, 274 × 6 - 1 = 1643. The pattern from term 2 is: multiply by (n+1) and adjust. But 7 × 2 + 1 ≠ 14, so 7 is wrong. The number 7 breaks the pattern.

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