[" Numbers "1,2,3,...,2n(n in N)" are pr...

[" Numbers "1,2,3,...,2n(n in N)" are printed "],[" on "2n" cards.The probability of drawing a "],[" number "r" is proportional to "r" ,then the "],[" probability of drawing an even number in "],[" one draw is "],[[" 1) "(n+2)/(n+3)," 2) "(n+1)/(n+3)," 3) "(1)/(2)," 4) "(n+1)/(2n+1)]]

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[" Numbers "1,2,3,...,2n(n in N)" are printed "],[" on "2n" cards.The probability of drawing a "],[" number "r" is proportional to "r" ,then the "],[" probability of drawing an even number in "],[" one draw is "],[[" 1) "(n+2)/(n+3)," 2) "(n+1)/(n+3)," 3) "(1)/(2)," 4) "(n+1)/(2n+1)]]

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