Q:
Find the number of ways in which 21 balls can be distributed among 3 persons such that each person does not receive less than 5 balls.
Answer & Explanation
Answer: A) 28
Explanation: Let x, y, z be the number of balls received by the three persons, then
Let
x + y + z =21
u + 5 + v + 5 + w + 5 = 21
u + v + w = 6
Total number of solutions =
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