Find the indicated probability. If P(A and B)=0.4, P(A) = 0.7, and
P(B) = 0.6, find P(A or B).

0.6

Step-by-step explanation:

0.6 is the answer;this is evident if you draw partially overlapping circles A&B. Place probability 0.3 in the common area (ANB) and 0.4 in the rest of circle A. Place probability 0.1 in the part of B that excludes that ANB area. That leaves 0.2 as outside all circles; you have four different probabilitys that add to 1.0.