Multiple choice

In the following number series find the missing term: $31, 43, 57, 73, 91, ?$

  1. $143$
  2. $111$
  3. $102$
  4. $105$

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

The pattern is adding consecutive even numbers starting from 12: 31+12=43, 43+14=57, 57+16=73, 73+18=91. Each difference increases by 2. The next difference is 20, so 91+20=111. The sequence of differences is 12, 14, 16, 18, 20 - consecutive even numbers. Option A (143) would require an incorrect jump of 52.

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