The pattern is that the number in the middle is obtained by multiplying the numbers on each sides and then dividing the result by '6'.
Eg : $$\frac{18\times3}{6}=3\times3=9$$
and $$\frac{36\times5}{6}=6\times5=30$$
Similarly, $$\frac{18\times19}{6}=3\times19=57$$
=> Ans - (B)
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