Answers

2014-02-10T23:25:33+08:00
N1+ N2 = 13; N1= 13-N2
D1 + D2 = 25

D=n/2 (n-3)

N1/2 (N1-3) + N2/2 (N2-3)=25
(13-N2)(13-n2-3)+n2(n2-3)=50


N2=8,5
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