determine the system relaibaility from the system shown below

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

answers;

$0\mathrm{.}849$

$0\mathrm{.}949$

$0\mathrm{.}994$

$0\mathrm{.}489$