Question 1199507
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Red cards: Diamonds and Hearts
Black cards: Spades and Clubs


The set of spades is subset of the black cards.
Meaning the event "select spade OR black" is the same as "select black card", as mentioned by the other tutor.


The type of cards we have left are: Hearts, Spades, and Clubs.


Two of those card categories are black, out of 3 categories total.


Therefore, we get 2/3 = <font color=red>0.667 approximately</font>.
Round that decimal value however needed.
The 6's go on forever, but of course we have to round at some point.
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