मात्रात्मक अनुसंधान दृष्टिकोण मुख्य रूप से किस दार्शनिक आधार पर आधारित है?

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?