You can put this solution on YOUR website! A coin is tossed 3 times. What is the probability of obtaining at least 1 head?
The probability of obtaining no heads, i.e. all tails is:
1/2*1/2*1/2 = 1/8
Therefore, the probability of obtaining at least one head is:
1 - 1/8 = 7/8
You can also see this by writing down all the possible outcomes. 7 of the 8 combinations will have at least one head.
