The minimum number of times one has to toss a fair coin so that the probability of observing at least one head is at least $90 \%$ is: (1) 2 (2) 4 (3) 5 (4) 3
The minimum number of times one has to toss a fair coin so that the probability of observing at least one head is at least $90 \%$ is:\\
(1) 2\\
(2) 4\\
(3) 5\\
(4) 3