Identify the number that doesn’t belong with the others 396, 462, 572, 427, 671, 264
Question and options
Identify the number that doesn’t belong with the others
396, 462, 572, 427, 671, 264
396, 462, 572, 427, 671, 264
- 396
- 427
- 671
- 264
Answer and explanation
Correct answer: B - 427
In 396, 462, 572, 671 and 264, the middle digit equals the exact sum of the outer digits (3 + 6 = 9, 4 + 2 = 6, 5 + 2 = 7, 6 + 1 = 7, 2 + 4 = 6), so the alternating sum of digits is zero and all five are multiples of 11. In 427, 4 + 7 = 11 ≠ 2, and 427 is not divisible by 11.
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CUSAT CAT M.Sc. Bioethics
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