Question 374978
There are 26 black cards, 26 red cards.
The prime number cards are the 2,3,5,and 7 (not counting the Jack as 11). 
Since the black 2, 3, 5, and 7 are already counted in the black cards, only count the red ones (diamonds and hearts).
{{{P(prime)=8/52}}}
{{{P(black)=26/52}}}
{{{P(P or B)=8/52+26/52=34/52=17/26}}}