Multiple choice

In the following number series, a term is wrong. Find the wrong number. (2, 2, 7, 23, 87, 342)

  1. $342$
  2. $87$
  3. $7$
  4. $2$
  5. $23$
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E Correct answer
Explanation

The pattern is: (previous × 1) + 0, (previous × 2) + 3, (previous × 3) + 5, (previous × 4) + 7, (previous × 5) + 9. Following this pattern: 2, 2×2+3=7, 7×3+5=26 (not 23), 26×4+7=111 (not 87), 111×5+9=564 (not 342). The number 23 should be 26 to fit the pattern.

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