Q: There are n sticks lined up in a row and
k of them are to be chosen.
(a) How many choices are there if there
must be at least l sticks between
each pair of chosen sticks? (是重複組合嗎??)
2. 試證將整數 2r+k 分成恰好 r+k 個整數之和
，當 k 是非負整數時，此分割方法數與k無關。
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