a fair 2 sided coin is flipped 3 times . what is the probability that tails will be the result at least twice , but not more than 3 times ?
"at least twice , but not more than 3 timesmeans exactly 2 times , 3 times the probability of getting exactly k results out of n flips is nck / 2 ^ n 3 c 2 / 2 ^ 3 = 3 / 8 option : c"
subtract(const_1, add(multiply(inverse(power(2, 3)), 3), add(inverse(power(2, 3)), inverse(power(2, 3)))))