Question 1046177
Assume independence for between the two events.

a)  P(HC) = P(H)*P(C) = 0.18*0.27 = 0.0486.


b)  P(H'C') = P(H')*P(C') = (1-P(H))*(1 - P(C)) = 0.82*0.73 = 0.5986.