What are the numbers of ways in which 5 similar balls will be put in 4 distinct

Question

What are the numbers of ways in which 5 similar balls will be put in 4 distinct baskets when the first basket has 0 balls?

Answer: Option B
:
B
0 balls are going to basket A. hence we will consider the distribution only in the remaining 3 baskets
B+C+D = 5
Total =

^{7} C_{2} = 21

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