$$$\lg\left(4\right)$$$

Laske $$$\log_{10}\left(4\right) = \lg\left(4\right) = \frac{\ln\left(4\right)}{\ln\left(10\right)}$$$.

Arvo on $$$\frac{\ln\left(4\right)}{\ln\left(10\right)}\approx 0.602059991327962$$$A.