Step-by-step explanation:
When you add P(A) and P(B), the overlap P(A and B) is counted twice. So you must subtract it to get the probability P(A or B).
If A and B are disjoint, then P(A and B) = 0, so it isn't necessary to subtract.
is this multiple choice?
Answer:
answer is b!
hope this helps!!!
Perimeter = 42 cm
A square has all equal sides so you would just add 10.5 + 10.5 + 10.5 + 10.5 to get 42 cm.
third option is the correct answer....
