- Show that C(n, r)C(r, 2) = C(n, 2)C(n - 2, r - 2) whenever n and r are integers with 2 < r < n.?

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Solve the equation for x.
e^x = 85? 15.00g of Si reacts with 25.00g of F2 to produce 28.67g of SiF4. Which reactant is the limiting reagent? The silica content of magma greatly affects its viscosity. Magma with a high silica content has a? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20? A constant current of 1A flow in circuit over period of 5s.total charge flowing through circuit over this duration will be.
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