Question

Events A and B are overlapping.

P(A) = 3/11

P(B) = 6/11

P(A and B) = 4/11
find p(a or b)

Answer 1

Use the formula

P(A or B) = P(A) + P(B) - P(A and B)

Answer 2

13/11 ?

Answer 3

no, 13/11 is larger than 1

Answer 4

so a probability larger than 1 is always impossible

Answer 5

P(A or B) = P(A) + P(B) - P(A and B)

P(A or B) = 3/11 + 6/11 - 4/11

P(A or B) = (3 + 6 - 4)/11

P(A or B) = 5/11