The logic here is
11 x 6 = 66
13 x 6 = 78
29 x 6 = 174
18 x 6 = 108
In all number pairs except 18 - 118, second number is the product of first number and 6.
$$\therefore\ $$18 - 118 is the odd number pair among the given number pairs.
Hence, the correct answer is Option C
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