7 Find the number of different arrangements that can be made of all 9 letters in the word CAMERAMAN in each of the following cases.
- There are no restrictions.
- The As occupy the 1st, 5th and 9th positions.
- There is exactly one letter between the Ms.
Three letters are selected from the 9 letters of the word CAMERAMAN. - Find the number of different selections if the three letters include exactly one M and exactly one A.
- Find the number of different selections if the three letters include at least one M.
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