ANSWER:
0.7
STEP-BY-STEP EXPLANATION:
We can calculate the value of P(A or B), using the following formula:
[tex]\begin{gathered} \text{ P\lparen A or B\rparen = P\lparen A\rparen + P\lparen B\rparen - P\lparen A and B\rparen} \\ \\ \text{ We replacing:} \\ \\ \text{ P\lparen A or B\rparen = }0.45+0.5-0.25 \\ \\ P\left(A\text{ }or\text{ }B\right)=0.7 \end{gathered}[/tex]Therefore, the value of P(A or B) is equal to 0.7
