3*(2+4)-1 = 17
4*4*2+2*3
(1+4) x (2 x 3)
How about: 2*(1+3+4) = 16
4+2+1=7 7*3=21
to get the number 25 using 1234 = 31 - 2 - 4
4x4x3+2
(12*4)+3 = 51
By the uniqueness of numbers, the only number for 1234 is 1234 itself.
1234
1234 is not a prime number.
Using the number lock press alt 1234
3*(2+4)-1 = 17
4*4*2+2*3
Ah, what a happy little challenge! To get the number 13 using only the digits 1, 2, 3, and 4, you can add 1, 2, 3, and 4 together. That would give you 10, then you can add 3 to that to get 13. Just remember, there are no mistakes, only happy accidents in math!
There are twelve possible solutions using the rule you stated.
(1+4) x (2 x 3)