what is the probability of getting a sum 9 from two throws of dice .
"explanation : total number of cases = 6 * 6 = 36 favoured cases = [ ( 3,6 ) , ( 4,5 ) , ( 6,3 ) , ( 5,4 ) ] = 4 so probability = 4 / 36 = 1 / 9 option b"
divide(const_2, choose(add(const_3, const_3), const_3))