there is a 20 % chance sandy will visit china this year , while there is a 60 % chance that she will visit malaysia this year . what is the probability that sandy will visit either china or malaysia this year , but not both ?
"p ( china and not malaysia ) = 0.2 * 0.4 = 0.08 p ( malaysia and not china ) = 0.6 * 0.8 = 0.48 total probability = 0.08 + 0.48 = 0.56 = 56 % the answer is c ."
divide(add(20, 60), multiply(multiply(const_5, const_5), const_4))