A card is drawn from a standard deck of playing cards is
.
The event is
.
The probability of
is
.
The probability of
is
.
The event is mutually exclusive event.
\Then,
.
Events that are not mutually exclusive:
.
The probability of
:
Substitute
,
and
.

(Add)
(Simplify)
The probability is
or about
.
The probability is
or about
.