Please help me to solve the following maths problem.
Four letters are selected from the word "MISLEAD". Find the number of combinations that include exactly two letters from "LEAD".
maths problem
2015-03-01 3:37 pm
回答 (1)
2015-03-01 4:13 pm
✔ 最佳答案
The number of combinations that include exactly two letters from "LEAD"and two from "MIS" is :
C(4,2) x C(3,2)
= 6 x 3
= 18
收錄日期: 2021-04-21 00:58:44
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https://hk.answers.yahoo.com/question/index?qid=20150301000051KK00016