you are right, sorry for that, we can't swap the operands.

And how would you get 9? Remember it's a ? b ? c where a=1, b=3 and c=2, you can add some parentheses too

try to check with
a = 1
b = 3
c = 2
you will see 8, not 9

You cannot swap the operands.

You can change the operations, but the operands order is always a, b and c.

Incorrect when:
a = 1
b = 3
c = 2
biggest number is:
b * (a + c)