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[sum(r=0)^(25){(50C(r))*(50-r(25-r))}=K(...

[sum_(r=0)^(25){(50C_(r))*(50-r_(25-r))}=K(50C_(25))" ,then "],[K" is equal to "],[" single Choice "(+4,-1)],[02^(25)],[02^(25)-1],[02^(24)],[O(25)^(2)]

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