three unbiased coins are tossed , what is the probability of ge ƫ ng at least 2 tails ?
"explanation : total cases are = 2 * 2 * 2 = 8 , which are as follows [ ttt , hhh , tth , tht , htt , thh , hth , hht ] favoured cases are = [ tth , tht , htt , ttt ] = 4 so required probability = 4 / 8 = 1 / 2 answer : c"
negate_prob(divide(const_1, power(const_2, const_3)))