In the following question, select the related number from the given alternatives.
63 : 108 : : 42 : ?
Given, 63 is related to 108
The logic here is
$$\frac{6^3}{2}=\frac{216}{2}=108$$ $$\longrightarrow\ $$ $$\frac{\text{first digit of first number}^{\text{second digit of first number}}}{2}=\text{second number}$$
Similarly,
$$\frac{4^2}{2}=\frac{16}{2}=8$$
$$\therefore\ $$42 is related to 8 in the same way 63 is related to 108.
Hence, the correct answer is Option B
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