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As a solution to the four fours problem (using the number four no more than four times to come up with the solution, 31 is equal to (4!+4)/4+4!
How about 4 times 7 is 28 and 8 divded by 2 is 4
Google "Four Fours" and you will find a number of solutions, presented more comprehensively than we can.
how do i make 17 using only 2 4 6 8
four