Problem: from a pack of cards , two cards are drawn one after the other , with replacement . what is the probability that the first card is a black card and the second card is a king or queen ?
Rationale: "p ( black card ) = 1 / 2 p ( king or queen ) = 2 / 13 p ( black card then a king / queen ) = 1 / 2 * 2 / 13 = 1 / 13 the answer is b ."
annotated_formula: multiply(divide(add(multiply(const_3, const_4), const_1), const_52), divide(const_2, const_52))