In Dhaka, the number of participants is more than 3000 and 100–150 are selected for the National Olympiad. In all of the problems in the Regional Olympiad, only the final answers are necessary.
In Dhaka, there are more than 3000 participants, and a select few (100 to 150) advance to the National Olympiad. In the Regional Olympiad, only the final answers are required for all problems.