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Here we select k element groups from n elements, regardless of the order, and the elements can be repeated. k is logically greater than n (otherwise, we would get ordinary combinations).

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Equilibrium Constant, often denoted by K c, is a numerical value that is derived from the ratio of the concentrations of the products to the concentrations of the reactants of a chemical solution at the state of equilibrium.The balance

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The value of your 401(k) at retirement is a function of how much you contribute, the matching provided by your employer and the appreciation of your 401(k) assets. To calculate your 401(k) at retirement we look at both your existing