Let r1 and r2 be the radii of the largest and smallest circles, respectively, which pass through the point (-4, 1) and have their centers on the circumference of the circle x2 + y2 + 2x + 4y - 4 = 0. If r1r2 = a + b√2, then a + b is equal to:

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?