Three of the following four number-pairs are alike in a certain way and one is different. Find the odd one out.
$$13-40: 13×3+1=40$$
$$18-55: 18×3+1=55$$
$$9-29: 9×3+2=29$$
$$17-52: 17×3+1=52$$
So, 29 is different from other options.
C is correct choice.
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