Solution
The pattern followed is that for $$a$$ $ $$b$$ = $$\frac{a+b}{2}$$
Eg : 11$25 = $$\frac{11+25}{2}=\frac{36}{2}=18$$
and 12$20 = $$\frac{12+20}{2}=\frac{32}{2}=16$$
Similarly, 4$50 = $$\frac{4+50}{2}=\frac{54}{2}=27$$
=> Ans - (C)
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