जब दो समाश्रयण रेखाएं (regression lines) एक-दूसरे के साथ सम्पाती (coincide) होती हैं, तो सहसंबंध गुणांक |r| का मान ________ होता है।

The arrival of which commission in India triggered widespread protests, including mass hartals across the country in 1928?

Which of the following leaders was instrumental in initiating and leading India’s struggle for independence?