1#
大 中
小 發表於 2019-12-31 09:48 AM (第 1550 天)
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Combination 問題
Wendy Winny
Chinese 10 6
American 5 8
The table above shows the numbers of Chinese and American postcards owned by Wendy and Winny. It is known that all postcards are different. If 3 postcards from each person are selected, how many combinations are possible?
A. 29C3
B. 15C3 + 14C3
C. 16C3 + 13C3
D. 16C3 X 13C2
請問有冇人解答到點解答案係D??