In the world of logic, "and/or" has no meaning. "And" means both, "or" means at least one, so "and" is just one of the 3 cases (for 2 variables) where the "or" output is true:
input1 input2 (input1 OR input2)
0 0 0
0 1 1
1 0 1
1 1 1 (this is the AND case)
"or" means an "inclusive or" where 1 OR 1 is 1, as opposed the "exclusive or, XOR" where the AND case is false, 1 XOR 1 is 0.
"and/or" is a phrase we tend to use in colloquial English, but "and" is subsumed by "or" so it's redundant and sometimes confusing.
For total clarity, you could draw up a 4-column truth table with your 3 inputs listed in 8 rows from 000 to 111 and then show the output as 0 or 1 for each of those cases.