4 There are four human blood groups; these are called \(\mathrm { O } , \mathrm { A } , \mathrm { B }\) and AB . Each person has one of these blood groups. The table below shows the distribution of blood groups in a large country.
| Blood group | |
| O | \(49 \%\) |
| A | \(38 \%\) |
| B | \(10 \%\) |
| AB | \(3 \%\) |
Two people are selected at random from this country.
- Find the probability that at least one of these two people has blood group O .
- Find the probability that each of these two people has a different blood group.