Syntel Company Numerical Ability Area and Volume

No: of spheres of radius 1 that can be got from sphere of radius (or diameter don't recall) 8

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Syntel Other Question

A sphere of radius 2cms is dropped into a cylinder of radius 4 cms containing water upto certain level. The raise in the water level is (not sure) (this was the last question) no idea what it stands for.. some kind of notation like S(P(M((D(a,b),2))):P(M(S(D(a,b),.. options were
1. ab 2.(a-b)^2 3.(a+b)^2 4.none