|A) 0.1||B) 0.2|
|C) 0.25||D) 0.3|
Each of the integers in the first set could be combined with any from the second set, giving a total of 4 x 5 = 20 possible pairs.
Of these the combinations that could give a sum of 23 are (5 + 18), and (9 + 14)
This means that the probability of getting a sum of 23 is 2/20 = 1/10