a bag contains 6 black and 4 white balls . one ball is drawn at random . what is the probability that the ball drawn is white ?
"let number of balls = ( 6 + 4 ) = 10 . number of white balls = 4 . p ( drawing a white ball ) = 4 / 10 = 2 / 5 . option b ."
divide(add(divide(divide(factorial(4), factorial(subtract(4, const_2))), factorial(const_2)), divide(divide(factorial(6), factorial(subtract(6, const_2))), factorial(const_2))), divide(divide(factorial(add(6, 4)), factorial(subtract(add(6, 4), const_2))), factorial(const_2)))