Multiple choice

In the following number series only one number is wrong. Find out the wrong number. 165 171 195 315 1030

  1. 171

  2. 195

  3. 315

  4. 1030

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The correct answer is A (171) because the pattern is: 165, 165+6=171, 171+24=195, 195+120=315, 315+715=1030. The increments are 6, 24, 120, 715 which follow 1×6, 4×6, 20×6, 119×6. The multiplier pattern is 1, 4, 20, 119 - which doesn't work smoothly. The number 171 should have been 171 to fit 1, 4, 20, 120 pattern.

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