1. There are 184 students taking classes in French. Of these, 112 are taking Intermediate French, 84 are taking French Literature, and 46 are taking French Cultural History. There are 66 students taking Intermediate French and French Literature, 37 students taking Intermediate French and French Cultural History, and 30 taking French Cultural History and French Literature. If 45 students take none of these three French classes, how many take all three (Intermediate French, French Literature, and French Cultural History)?
2. How many seven-digit telephone numbers are there with all digits different? Answer the same question including area codes (so for ten-digit telephone numbers). What if we include country codes (each is two or three digits long) as well?