Problem: three unbiased coins are tossed . what is the probability of getting 3 heads and 1 tail ?
Rationale: "let , h - - > head , t - - > tail here s = { ttt , tth , tht , htt , thh , hth , hht , hhh } let e = event of getting 3 heads then e = { hhh , hth , thh , hht } p ( e ) = n ( e ) / n ( s ) = 4 / 8 = 1 / 2 answer is d"
annotated_formula: negate_prob(divide(const_1, power(const_2, const_3)))