what is the probability of getting a sum 9 from two throw of a dice ?
"in two throws of die , n ( s ) = 36 let e = event of getting a sum 9 = { ( 3,6 ) , ( 4,5 ) , ( 5,4 ) , ( 6,3 ) } p ( e ) = 4 / 36 = 1 / 9 answer c 1 / 9"
divide(const_2, choose(add(const_3, const_3), const_3))