The ratio of the coefficients of xm and xn in the expansion of 1-xm-n is

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The ratio of ...

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The ratio of the coefficients of x^m and xⁿ in the expansion of (1 + x)^{m + n} is ___________.

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The coefficient of $x^{m}$ in $(1 + x)^{m} + (1 + x)^{m + 1} + . . . . . + (1 + x)^{n}$ , m £ n is

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