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De este modo:
a) 2/7 y 4/7:
NI = (1/2)(2/7+4/7)=(1/2)(6/7)=3/7
b) 1/6 y 1/9
NI=(1/2)(1/6+1/9)=(1/2)((3+2)/18))=5/36
c) 1/18 y 1/17
NI = (1/2)(1/18+1/17)=(1/2)((17+18)/306)=35/612
d) 4/10 y 6/10
NI = (1/2)(4/10+6/10)=(1/2)(10/10)=1/2
e) 28/100 y 34/100
NI=(1/2)(28/100+34/100)=(1/2)(62/100)=31/100
Saludos!! Jeizon1L