The pattern followed is that the positive difference of the number is multiplied by 2.
Eg : 7x1 = $$(7-1)\times2=6\times2=12$$
and 5x4 = $$(5-4)\times2=1\times2=2$$
and 6x4 = $$(6-4)\times2=2\times2=4$$
Similarly, 7x4 = $$(7-4)\times2=3\times2=6$$
=> Ans - (B)
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