Which number is the odd one out? 9678 4572 5261 3527 7768
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7768
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3527
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4572
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5261
Reveal answer
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B
Correct answer
Explanation
Find the pattern: 9678 (9+6+7+8=30), 4572 (4+5+7+2=18), 5261 (5+2+6+1=14), 7768 (7+7+6+8=28), 3527 (3+5+2+7=17). The sums are 30, 18, 14, 28, 17 - all are even except 3527 with sum 17 (odd). 3527 is the odd one out based on digit sum parity.
AI explanation
3527 is the odd one out. Each of the other numbers (9678, 4572, 5261, 7768) contains exactly two even digits, but 3527 (digits 3, 5, 2, 7) contains only one even digit — the 2. Checking: 9678 has 6 and 8 even; 4572 has 4 and 2 even; 5261 has 2 and 6 even; 7768 has 6 and 8 even. Only 3527 breaks the two-even-digits pattern, making it the exception in the set.