Two integers are randomly selected from sets below, one integer from set A and one
integer from set B. A = { 5,6,7,8,9}, B = {3,4,5,6}.What is the probability that the sum
of two integers will equal 9?

Question

Two integers are randomly selected from sets below, one integer from set A and one
integer from set B. A = { 5,6,7,8,9}, B = {3,4,5,6}.What is the probability that the sum
of two integers will equal 9?

anonymous · Answer

the probability is 2/20

anonymous · Answer

the sample space is 5x4 = 20 possible outcomes

anonymous · Answer

and there are only two outcomes that give 9 - 5,4 and 6,3

anonymous · Answer

thanks stewart

raden · Answer

5,4 is different with 4,5 also 6,3 and 3,6

kc_kennylau · Answer

$$\text{Probability}=\frac{\text{Matching number of cases}}{\text{Total number of cases}}$$