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Three balls of spherical shape are placed in a hollow inverted cone one above the other. Each ball is in contact with the adjacent ball(s). Also, each ball is in contact with the wall of the cone. The smallest ball has a radius of 8 cm. The largest ball has a radius of 18 cm.

The minimum height of the cone, such that the largest ball does not protrude out of the cone, is

 
72 cm
76 cm
108 cm
116 cm
95 cm

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Plz explain

??? what is P ?? please explain in details..

Applying the rule of similarity, we have = K (Let) what does this means????

Explanation can be found at #79, same data with different value being asked to find

108