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→Determining Meson Composition
<math>-1 = -\frac{1}{3} + x</math>
K<sup>-</sup> has a [[Negative Charge|negative charge]]. This can be achieved with one its [[strange-quark]] with a [[Electrical Charge|charge]] of <math>-\frac{1}{3}</math>[[Elementary Charge|e]] and another [[Electrical Charge|charge]] of <math>-\frac{2}{3}</math>[[Elementary Charge|e]] (an [[antiup-quark]]).
Since <math>-1 = -\frac{1}{3} + -\frac{2}{3}</math>