Problem: on a ranch , a rancher can place a loop of rope , called a lasso , once in every 3 throws around a cow ’ s neck . what is the probability that the rancher will be able to place a lasso around a cow ’ s neck at least once in 3 attempts ?
Rationale: "p ( missing all 3 ) = ( 2 / 3 ) ^ 3 = 8 / 27 p ( success on at least one attempt ) = 1 - 8 / 27 = 19 / 27 the answer is d ."
annotated_formula: subtract(const_1, power(divide(const_1, 3), 3))