(A) [m/(m – r)] d
(B) [m/(m + r)] d
(C) [(m + r)/ m] d
(D) [(r – m)/m] d
(A) [m/(m – r)] d
(B) [m/(m + r)] d
(C) [(m + r)/ m] d
(D) [(r – m)/m] d
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