prove that the coefficient of x^r in the expansion of (1-2x)^-1/2 is (2r)!/2^r.(r!)^2

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prove that the coefficient of x^r in the expansion of (1-2x)^-1/2 is (2r)!/2^r.(r!)^2

prove that the coefficient of x^r in the expansion of (1-2x)^-1/2 is (2r)!/2^r.(r!)^2

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prove that the coefficient of x^r in the expansion of (1-2x)^-1/2 is (2r)!/2^r.(r!)^2

prove that the coefficient of x^r in the expansion of (1-2x)^-1/2 is (2r)!/2^r.(r!)^2

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