a bag contains 6 black and 9 white balls . one ball is drawn at random . what is the probability that the ball drawn is white ?
"let number of balls = ( 6 + 9 ) = 15 . number of white balls = 9 . p ( drawing a white ball ) = 9 / 15 = 3 / 5 hence answer is e"
divide(add(divide(divide(factorial(9), factorial(subtract(9, const_2))), factorial(const_2)), divide(divide(factorial(6), factorial(subtract(6, const_2))), factorial(const_2))), divide(divide(factorial(add(6, 9)), factorial(subtract(add(6, 9), const_2))), factorial(const_2)))