Answer:
See attached
Step-by-step explanation:
Answer is attached
Yo sup??
the answer is 1 because
P(E)+P(E')=1
where E is the event and
E' is the complement of the event
Hope this helps
Answer:

Step-by-step explanation:


My guess is 9 hours, because since pipe a takes 12 hours and with pipe b it takes 9, it's 12-9=3
I think.