The logic here is
16 x 1.5 = 24
17 x 1.5 = 25.5
18 x 1.5 = 27
19 x 1.5 = 28.5
In all number pairs except 17 - 23.5, second number is the product of first number and 1.5.
$$\therefore\ $$17 - 23.5 is the odd number pair among the given number pairs.
Hence, the correct answer is Option B
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