Attached is a ven diagram which may be helpful for this problem.
Each number is a probability. The sum of all the numbers is P(A or B or C).
To find these numbers, start in the middle and work your way out.
The middle is P(A and B and C), which is 1. Then simply subtract this from each of the larger intersections.
Finally the parts not in an intersection. Only in A not B not C. You just subtract the numbers in A from P(A). ---> 38 - 10 -1 - 1 = 26
Add them up and you get 58.
P(A or B or C) = 0.58
Each number is a probability. The sum of all the numbers is P(A or B or C).
To find these numbers, start in the middle and work your way out.
The middle is P(A and B and C), which is 1. Then simply subtract this from each of the larger intersections.
Finally the parts not in an intersection. Only in A not B not C. You just subtract the numbers in A from P(A). ---> 38 - 10 -1 - 1 = 26
Add them up and you get 58.
P(A or B or C) = 0.58