Update README.md

Corrected wrong notation

README.md

@@ -42,7 +42,7 @@ Each sample is stored as a JSON object with the following fields:
 |--------------------|-----------|-----------------------------------------------------------------------------|
 | `question`         | `string`  | Math problem text (can include LaTeX)                                      |
 | `answer`           | `string`  | Final answer (NAT or symbolic form)                                        |
-| `question_type`    | `int`     | `0 = Numerical Answer Type`, `1 = Multiple Choice Question`                |
+| `question_type`    | `int`     | `1 = Numerical Answer Type`, `0 = Multiple Choice Question`                |
 | `options`          | `list`    | List of answer choices (present only for MCQ)                              |
 | `correct_options`  | `list`    | Indices of correct options in `options[]` (for MCQ only)                   |
 | `additional_data`  | `dict`    | Placeholder for extended fields used during model training or evaluation.  |