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In the expansion of (1+a)^(m+n), prove t...

In the expansion of `(1+a)^(m+n)`, prove that the coefficient of `a^m` and `a^n` are equal.`

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  9. Show that the coefficient of the middle term in the expansion of (1+x)...

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  14. Find a, b and n in the expansion of (a+b)^n if the first three terms o...

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