So we want to know how can we use numbers 2, 3, 5, 8 to get 104. There are two ways to do it. First way: (2*5-3)*8=(15-3)8=13*8=104 and the second way is pretty similar to the first way (2*5+3)8=(10+3)8=13*8=104. So those are the two ways to get 104 using those 4 numbers.