The pattern followed is for $$a$$@$$b$$ = $$(a-b)\times2$$
Eg = 9@3 = $$(9-3)\times2=6\times2=12$$
and 15@4 = $$(15-4)\times2=11\times2=22$$
and 16@14 = $$(16-14)\times2=2\times2=4$$
Similarly, 6@2 = $$(6-2)\times2=4\times2=8$$
=> Ans - (D)
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