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(iv)Three students are chosen at random.Find the probability that exactly 1 is studying Music and exactly 2 are boys.
(iv)随机选择三个学生。求正好 1 个在学习音乐,正好 2 个是男生的概率。

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(b)Find the total number of different arrangements of the 8 letters in the word TOMORROW that have an R at the beginning and an R at the end,and in which the three Os are not all together.
(b)查找单词 TOMORROW 中开头有 R,结尾有 R 的 8 个不同排列的字母的总数,其中三个 O 并不都在一起。

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