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505-555 (Easy)|   Overlapping Sets|                           
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ArnauG
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porronisi
Since the question mentions atleast 1, should we be including exactly 2 countries in the answer as well, i.e 67+6+11? just trying to see which key word I am missing in interpreting the question.
The formula we use is:

n(E or F or I) = n(E) + n(F) + n(I) - n(E and F) - n(F and I) - n(E and I) + n(E and F and I)

When we plug in the numbers, we get:
= 26 + 26 + 32 - 0 - 11 - 6 + 0 =
= 67

That formula subtracts the 6 and 11 because those groups were counted twice when adding 26+26+32. After subtracting them, they are already included exactly once in the final 67, so you do not add them again.

Please study the thread carefully for more.
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