There are three prime numbers a, B and C, a + B = 20, B + C = 30, a × B × C =? The results I know: 7, 13, 17, the best equation

There are two sets of solutions
a+b=20
b+c=30
So we have C-A = 10
After sorting out, there are two groups of possible solutions: 3 13 or 7 17
The first group is 3 17 13
The second group is 7 13 17
Then take the bus

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