Question

Find P(A or B), if the events are disjointed. P(A) = 9/25 P(B) = 9/25

Answer 1

Answer:
`P(A\ or\ B) = (18)/(25)`

Explanation:

We know that when two events are disjoint then their intersection is empty.

if A and B are disjoint then
`P(\cap B)=0`

Also, we know that the probability of getting A or B is given by :

`\text{P(A or B)}=P(A)+P(B)-P(A\cap B)\\\\\Rightarrow\ P(\text{A or B})=(9)/(25)+(9)/(25)\\\\\Rightarrow\ P(\text{A or B})=(18)/(25)`