The only way to get 12 using four 4's is to add 4 to 44 and divide by 4.
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A solution to the four fours problem for the number 33 is: 33 = (4-.4)/.4+4!
Using four fours, you can get 19 with the following sum: 4! - 4 - (4 / 4) That is, four factorial minus four - (four divided by four) - 24 - 4 - (4 / 4) = 19
11 = 4/.4 + 4/4
(4 + 4 + 4) ÷ 4 = 12 ÷ 4 = 3.
it is not posible *Ahem*. 4*4+4/sqrt(4)