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Answer : 1 28 Explanation : Answer: A) 28 Explanation: Let x, y, z be the number of balls received by the three persons, then  x≥5, y≥5, z≥5 and x y z=21 Let u≥0, v≥0, w≥0 then ∴ x y z =21 ⇒ u 5 v 5 w 5 = 21 ⇒ u v w = 6  ∴Total number of solutions = C3-16 3-1=C28=28

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