Frog Antidote
You have been working in your lab to find a cure to the disease called Supervirus. Here is the antidote: Blood of Male berryfrogs. Now berry frog males and females are identical and can be either white or black but males only croak.
You are now in the middle of the Forest and you hear a croak behind you, you look around and see a black and a white frog, now if you take the blood of a female Supervirus can spread easily. So here's the question : what is the possibility that one frog is the male?
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1 solution
Here are the possibilities:
1 male : 1 female
1 female : 1 male {one is black, one is white)
1 male : 1 male { There are two males not one)
1 female : 1 female
But the last one is FEMALE:FEMALE which cannot be true because only males can croak. So its 3 2