Multiple choice

In each of these questions a number series is given. In each series only one number is wrong. Find out the wrong number. $17, 20, 46, 147, 599, 3015, 18018$

  1. $20$
  2. $46$
  3. $599$
  4. $147$
  5. $3015$
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C Correct answer
Explanation

The pattern is: multiply by increasing consecutive integers (1, 2, 3, 4, 5, 6) and add multiples of 3 (3, 6, 9, 12, 15, 18). Starting from 17: 17×1+3=20, 20×2+6=46, 46×3+9=147. At step 4, we should get 147×4+12=600, but the series shows 599. The pattern then continues correctly: 600×5+15=3015, 3015×6+18=18108. Therefore, 599 is the wrong number.

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