Please submit your concern

Explanation:

If no condition is imposed then we can select countries in 23 – 1 = 7 ways.

So, we have total 7 combinations.

Hence, option (c).

Note:- This question is ambiguous, as it is asking number of countries. In that case, we can select only 3 countries. But we don't have options. So here we are assuming number different combinations are asked.