UPSC NDA Math Model Paper 10

1. The two spheres intersect each other. Here distance = 3 (From the previous solution) and sum of radii = 3 + 1 = 4 As, distance is less than the sum of radii, the spheres intersect each other 2. The radius of the first sphere is less than that of the second sphere. Radius of the first sphere is 1, and that of other is 3.This statement is correct Hence, option (3) is correct.