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[" The value of "sum(r=0)^(50)(-1)^(r)(^...

[" The value of "sum_(r=0)^(50)(-1)^(r)(^(50)C_(r))/(r+2)" is equal to "],[[" (1) "(1)/(50times51)," (2) "(1)/(52times50)],[" (3) "(1)/(52times51)," (4) none of these "]]

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