A fair 2 sided coin is flipped 4 times. What is the probability that tails will be the result at least twice, but not more than 4 times?
Answers:  A) 1/8  B) 2/3  C) 5/8  D) 4/7  E) 3/7
at least twice, but not more than 4 timesmeans exactly 2 times, 3 times, 4 times   The probability of getting exactly k results out of n flips is n5/8k/2^n   45/82/2^4+45/83/2^4=10/16=5/8   Option: 5/8
<result>C</result>
A fair 2 sided coin is flipped 4 times. What is the probability that tails will be the result at least twice, but not more than 4 times?