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Loginn = Vv/Vt = Vv/Vs+Vs =0.5
n=e/(e+1) after puting value of e which is 1
n=1/(1+1) = 1/2 = 0.5
So porosity=0.5
And void ratio =1
n=e/(1+e)=1/(1+1)=1/2=.5