There are 180 pupils in a group. The only languages available for the group to study are Spanish, German and Italian.

17 pupils study the three languages.
50 pupils study both Spanish and German.
43 pupils study both German and Italian.
33 pupils study both Italian and Spanish.
33 pupils study Spanish only.
33 pupils study German only.
11 pupils study Italian only.

Find the probability to select a pupil that studies German.