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[" A box contains "15" green and "10" ye...

[" A box contains "15" green and "10" yellow balls.If "10" balls are randomly drawn,one-by-one,with "],[" replacement,then the variance of the number of green balls drawn is: "],[[" (1) "(12)/(5)," (2) "6],[" (3) "4," (4) "(6)/(25)]]

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