[Amps] resonance

[Peter Chadwick]

The only definition that holds up for both parallel and series cases (and multi branch cases, too) is that the applied V and I are in phase, i.e. the input to the circuit looks resistive. This definition holds over all values of Q, too.
XL = XC is a convenient approximation when Q is high (say, >20). But it doesn't necessarily readily apply to multiple branch circuits such as pi networks.
But that would be wrong answer if you were taking the Extra Class exam!
73
Peter G3RZP