Question 1093342
close but not quite
A mutually exclusive pair of events are complements to each other. For example: If the desired outcome is heads on a flipped coin, the complement is tails. Complement rule. The Complement Rule states that the sum of the probabilities of an event and its complement must equal 1, or for the event A, P(A) + P(A') = 1

Mr  greenestamps, your solution is wrong. 
Neither 60+40=1 nor 60% + 40% =1
.6+.4=1
The correct answer based on the definition of the complement rule must be .6 to complement .4 

Quit your constant degradation of tutors responses. If you want to add your two cent solutions, do so but without insulting the volunteer tutors.
And that goes for maththerapy who is constantly picking on a few special tutors.