Yeah though I think “at least one” is clearer than “just one”.
That is a good guess and a useful concept. However, FYI, xor often means “an odd number of inputs are true”.
Prefix means the operator comes first, infix means in the middle and postix means at the end.
and(1,1) is prefix. 1&1 is infix. (1,1)and is postfix.
Assignment:
Define or(x,y,z) using only operators that take 2 or fewer inputs.