3.
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You can tell a number is divisible by 3 when the sum of its digits is equal to 3 or a multiple of three. In this instance, 1 + 2 + 9 = 12/3 = 4, therefore 129 is divisible by 3.
3 or 129.1, 3, 43, 129
129 is divisible by: 1 3 43 129.
1 3 43 and 129.
129 is divisible by 1 3 43 and 129.