Solution
The logic here is
9 x 3 = 27
12 x 3 = 36
6 x 3 = 18
15 x 3 = 45
In all number pairs except 15 - 43, second number is the product of first number and 3.
$$\therefore\ $$15 - 43 is the odd one among the given number pairs.
Hence, the correct answer is Option B
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