If there's one node in the middle how many antinodes are there

I think it's 2 but can someone tell if im right or wrong and give me a reason why

The question is ambiguous, because there could be other nodes either side of the middle in between the antinodes. In which case there could be any number of nodes and antinodes.

But if there is only the one node, and its in the middle, then yes there are two antinodes, one at each end. Symmetry, and a simple sketch proves it - there's no other way to draw it!