$P(minstens\,1\,goed)$=$1-P(nul\,goed)$

$P(nul\,goed)$=$\frac{35}{41}\cdot\frac{34}{40}\cdot\frac{33}{39}\cdot\frac{32}{38}\cdot\frac{31}{37}\cdot\frac{30}{36}\approx0,361$

$P(minstens\,1\,goed)$ $\approx1-0,361$=$0,639$