Identify which of the following is not a member nation of G20:
- The G20 comprises 19 countries and the European Union, focusing on global economic issues.
- Bangladesh is not a member of the G20, whereas Brazil, Australia, and Argentina are members.
If vector \( \mathbf{a} = 3 \hat{i} + 2 \hat{j} - \hat{k} \) \text{ and } \( \mathbf{b} = \hat{i} - \hat{j} + \hat{k} \), then which of the following is correct?