Problem: two unbiased coins are tossed . what is the probability of getting at most one head ?
Rationale: "s = { hh , tt , ht , th } e = event of getting at most one head . e = { tt , ht , th } . p ( e ) = n ( e ) / n ( s ) = 3 / 4 answer is option c"
annotated_formula: negate_prob(divide(const_1, power(const_2, const_3)))