Select the number that can replace the question mark (?) in the following figure series.
From the figure A,
14 + 18 - 8 = 24
From the figure B,
2 + 8 - 2 = 8
The logic here is
$$\text{bottom left number}+\text{bottom right number}-\text{top number}=\text{middle number}$$
Similarly, from the figure C
The required number = 12 + 10 - 4 = 18
Hence, the correct answer is Option D
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