Because each course has two matching strings, a complete set contains two of each gauge.
A-style and F-style mandolins don't need different strings because of body shape. If both are standard 8-string mandolins with comparable scale lengths in G D A E, they can use the same type of set.
Don't assume a standard mandolin set fits a mandola, octave mandolin, mandocello or other mandolin-family instrument. They can use different scale lengths, tunings and string requirements.