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K<sup>-</sup> has a [[strangeness]] of -1, therefore it contains a [[strange-quark]].
K<sup>-</sup> has a [[Negative Charge|negative charge]]. This can be achieved with one its [[strange-quark]] with an a [[Electrical Charge|charge]] of [[<math>-\frac{1}{3}</math> and another [[Electrical Charge|charge]] of <math>-\frac{2}{3}</math> (an [[antiup-quark]]).
Therefore <math>K^- = S + \bar{u}</math>