Well, honey, you take 1 + 2 + 3 + 4 + 1 + 2 + 3 + 4. That equals 20. It's as simple as that. Math can be a piece of cake when you know the tricks.
4*4*2+2*3
3*(2+4)-1 = 17
(1+4) x (2 x 3)
How about: 2*(1+3+4) = 16
4(2+3)-1=19
4x4x3+2
By the uniqueness of numbers, the only number for 1234 is 1234 itself.
4*4*2+2*3
3*(2+4)-1 = 17
4 + 3 + 2 - 1 = 8
2^(4+1)-3
(1+4) x (2 x 3)
How about: 2*(1+3+4) = 16
17 = (4+2)*3 - 1
18 = (4 × 3) + (2 × 1)
It can be: 2*3+4+1 = 11
The answer is 34(1)^2.