Question 7
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In how many ways can 10 identical balls be placed in 4 different boxes so that each box gets at least 2?
- A 84
- B 35
- C 20
- D 10 Correct
Correct Answer: Option D
Put 2 in each first; 2 balls remain
Share 2 among 4 boxes freely: (2 + 3)C3 = 10
Trap: 84 = 9C3 needs only one ball in each.
Answer: 10
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