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04-02-2020
Mathematics

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The rth term of expansion of [tex]\left[\begin{array}{ccc} x + 1/ x \\\\\end{array}\right]^ {2r}[/tex]

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04-02-2020

Yo sup??

[tex]T_r=^2^rC_r_-_1x^r^-^1(1/x)^r^-^1\\=^2^rC_r_-_1\\=(2r)!/((r-1)!)^2[/tex]

[tex]where \\^nC_r=n!/(n-r)!*r![/tex]

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