Answer
Let A denote adults that hold the opinion that there will be another housing bubble in the next four to six years.
P(A) = 0.4, P(A') = 1-0.4=0.6
P(A∩A∩A) =$ 0.4\times0.4\times0.4 = 0.064$
P(A'∩A'∩A') =$ 0.6\times0.6\times0.6 = 0.216$
Work Step by Step
See above.