The positive difference of the number is multiplied by 2.
Eg = 9@7 = $$(9-7)\times2=2\times2=4$$
and 6@1 = $$6-1)\times2=5\times2=10$$
and 7@4 = $$(7-4)\times2=3\times2=6$$
Similarly, 8@2 = $$(8-2)\times2=6\times2=12$$
=> Ans - (D)
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