"^10(C0)^2-"^10(C1)^2+"^10(C2)^2-......-...

`"^10(C_0)^2``-``"^10(C_1)^2``+``"^10(C_2)^2``-`......`-`(`"^10C_9)^2``+`(`"^10C_10)^2=`

`10!`

`(""^(10)C_(5))^(2)`

`""^(_10)C_(5)`

`""^(10)C_(5)`

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