Suppose you flip a fair coin 7 times. What is the probability that, in 7 flips, you get at least one head? Select the correct option
A) 57/58
B) 23/28
C) 127/129
D) 127/128
E) 64/65
Best way of solving an at least 1 type of question is to compute 1 - probability of flipping 0 heads   probability of flipping either a head or a tail = 1/2   probability of flipping 3 tails in a row (1/2)^5   probability of flipping at least 1 head = 1 - (1/2)^7 = 127/128   Answer : 127/128
<result>D</result>
Suppose you flip a fair coin 7 times. What is the probability that, in 7 flips, you get at least one head?