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truyen223


chứng minh
[TEX]C^0_{2n} + C^2_{2n}.3^2 + C^4_{2n}.3^4 + .... + C^{2n}_{2n}.3^{2n}[/TEX] = [TEX]2^{2n-1}.(2^{2n} + 1)[/TEX]
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[TEX]C^0_{2n} + C^2_{2n}.3^2 + C^4_{2n}.3^4 + .... + C^{2n}_{2n}.3^{2n}[/TEX] = [TEX]2^{2n-1}.(2^{2n} + 1)[/TEX]
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