At a conference of 250 people, 30% of the participants are French, 35% are Americans, 20% are Germans, and the rest are of the other nationalities. Among any 3 participants, what is the probability that they are not all from other countries?
A: 50
B: 75
C: 150
D: 175

Question

At a conference of 250 people, 30% of the participants are French, 35% are Americans, 20% are Germans, and the rest are of the other nationalities. Among any 3 participants, what is the probability that they are not all from other countries? 
A: 50
B: 75
C: 150
D: 175

welshfella · Answer

30 + 35 + 20 = 85% are form either France, USA or Germany.
so 15% are from other countries.

anonymous · Answer

I still don't get it @welshfella

welshfella · Answer

looking at it again II ;m not sure - its been a long time since I did these. Sorry i cant help