If water drops are falling at regular time intervals from ceiling of height H, then position of drop from the ceiling is (when nth drop falling from the ceiling and rth drop is in its way)

Options

A. `((n-1)^2)/((n-r)^2)H`
B. `((n-r)^2)/((n-1)^2) H`
C. `((n-r)^2)/((n+1)^2) H`
D. `((n+1)^2)/((n+r)^2) H`

Answer

B