determine the system reliability for the system shown below

r$1=0\mathrm{.}85$ connected to r$2=0\mathrm{.}91,$r$3=0\mathrm{.}96$ r$4=0\mathrm{.}89$ r$5=0\mathrm{.}98$ all connected to r$6=0\mathrm{.}85$

answers;

$0\mathrm{.}217$

$0\mathrm{.}721$

$0\mathrm{.}271$

$0\mathrm{.}127$