Answer:
p=1
Step-by-step explanation:
A deck has a combined 52cards.
Given that you're certain to select a red or black card:-
p(red)=>[tex]p(red)=\frac{26}{52}[/tex]
p(black)=>[tex]p(black)=\frac{26}{52}[/tex]
Therefore total probability of selection is expressed as:-
[tex]p=p(red)+p(black)\\p=\frac{26}{52}+\frac{26}{52}\\=1[/tex]