The pattern followed is that for $$a$$#$$b$$ = $$\frac{(a-b)}{2}$$
Eg : 19#13 = $$\frac{19-13}{2}=\frac{6}{2}=3$$
and 25#3 = $$\frac{25-3}{2}=\frac{22}{2}=11$$
and 36#10 = $$\frac{36-10}{2}=\frac{26}{2}=13$$
Similarly, 7#3 = $$\frac{7-3}{2}=\frac{4}{2}=2$$
=> Ans - (B)
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