lim [ln (1+nx)]/x=lim (1/x)*ln(1+nx)=lim ln(1+nx)^(1/x)=
ln lim (1+nx)^(1/x) = ln lim [(1+nx)^(1/nx)]*n=ln e^n=n*ln e=n
But, from hypothesis, lim [ln (1+nx)]/x=3, so n=3
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