Day 4: All these numbers but one have "sum" thing in common. Which one doesn't belong?

29, 47, 61, 83
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Day 4: All these numbers but one have "sum" thing in common. Which one doesn't belong?
29, 47, 61, 83

61 doesn't belong in the group: 6 + 1 = 7

The others add up to 11:
2 + 9 = 11
4 + 7 = 11
8 + 3 = 11
by Level 11 User (78.4k points)

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