If country D always has a developing country to its right in how many different arrangements can country B be a developing country?

Out of A, B, C, D & E, three are developed countries, and two are developing countries.

a) Country A is a developed country.

b) The country A which is a developed country. will always take a seat a far as possible from country B

These are the two possible positions.

c) It is given that no two developing countries will sit next to each other and country D will always be seated next to a developing country.

Hence country D is a developed country.

It is given in the question that 'D' has a developing country to its right.

So, two  'B', 'C' and 'E' are developing countries.

Now, what can be the possible positions of D.

There are 4 possible positions for D.

Of these positions only at 3, 4 D has B to it right. So, The answer is 2.