Multiple choice general knowledge math & puzzles

396, 462, 572, 396, 427, 671, 264

  1. 396

  2. 427

  3. 671

  4. 264
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In 396, 462, 572, 396, 427, 671, 264, if we sum the digits: 396→18, 462→12, 572→14, 396→18, 427→13, 671→14, 264→12. The number 427 is unique because its digit sum is 13, which appears only once, while other sums (12, 14, 18) repeat.

AI explanation

All the other numbers are exactly divisible by 11 (396=36×11, 462=42×11, 572=52×11, 671=61×11, 264=24×11), but 427 divided by 11 leaves a remainder, so it breaks the pattern. This kind of series test relies on checking a common divisor across most terms.

Keep practicing — related questions