A medical control system has three components in series with individual reliabilities $($R$1,$ R$2,$ and R$3)$ as shown:

R$1$ R$2$ R$3$

$0\mathrm{.}990\mathrm{.}980\mathrm{.}90$

The company is now considering a redesign of the medical control system to include a redundant parallel system:

$0\mathrm{.}990\mathrm{.}980\mathrm{.}90$

$0\mathrm{.}990\mathrm{.}980\mathrm{.}90$

What are the following reliabilities:

a$)$ The reliability for the original before the new medical control system design?

b$)$ The reliability with this new medical control system design?