(12*4)+3 = 51
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to get the number 25 using 1234 = 31 - 2 - 4
There are twelve possible solutions using the rule you stated.
2^(4+1)-3
17 = (4+2)*3 - 1
1234 is a single number and so there is no middles number. Also, would you mind checking your spelling when posting questions?