Which number is the odd one out?
7768 9678 4572 5261 5133 4638 6895
4638: in the other numbers the sum of the first two digits is equal to the sum of the second two digits, for example in 5133 we have 5+1 = 3+3.
7768 9678 4572 5261 5133 4638 6895
4638: in the other numbers the sum of the first two digits is equal to the sum of the second two digits, for example in 5133 we have 5+1 = 3+3.
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