Question

P(A)=0.4 P(B)=0.3 and P(A and B)=0.6 find P(A or B)

Answer 1

use the formula :
P(A or B) = P(A) + P(B) - P(A and B)

Answer 2

So 0.4+0.3-0.6 equals P(A or B)?

Answer 3

P(A ∪ B) = P(A) + P(B) - P(A ∩ B))

Answer 4

right

Answer 5

"P(A)=0.4 P(B)=0.3 and P(A and B)=0.6 "

this is not possible

Answer 6

the event (A and B) is a subset of A and a subset of B. thus

\[P(A\text{ and }B)\le P(A)=.4\]
\[P(A\text{ and }B)\le P(B)=.3\]

thus

\[P(A\text{ and }B)\le.3\] and so it can't equal .6

Answer 7

ty:)))