Question

a fair coin is tossed 10 times in a row. what is the probability of getting at least 2 heads ? (hint: use combinatorics)

Answer 1

Explanation:

If you flip a fair coin 10 times, you can get 0 heads about 0.1% of the time, 1 head about 1% of the time, 2 heads about 4% of the time, 3 heads about 12% of the time, 4 heads about 21% of the time, and 5 heads about 25% of the time. Thus, the chances of getting 5 heads is about 1 in 4.