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Complex Numbers, J Notation

Is it possible to establish the frequency of a sinusoidal voltage source when that source is presented in the format: 10+j20.
I have a circuit with reactances XL= +300 and XC= -200, and must establish the resonant frequency, Fo= 1/ 2pi sqrt(LC).
However no base frequency provided from which to determine values of L and C.
Thanks for your help.

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