Answer:3/7
Step-by-step explanation:
Since a coin has a head(H) and a tail(T), if two coins are flipped, the total outcome will be 4 i.e(HH, HT, TH and TT)
If 3coins are now flipped, then we will have 8total possible outcomes. The general formula being '2^n' where n is the number of coins.
The outcomes will be matching (H,T) with (HH, HT, TH, TT) to give (HHH, HHT, HTH, HTT, THH, THT, TTH and TTT). Since at least one if the 3coins shows head, then we have 7total possible outcomes excluding TTT.
Probability that exactly two of the three coins shows head (possible outcome/total outcome)
Exactly 2heads are HHT,HTH and THH(3possible outcomes)
Total outcome is 7
P(exactly two heads) = 3/7
