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In the following characters are chosen from the set of 26 letters, the set of 10 digits, or the set of 4 special characters. 8.

In the following characters are chosen from the set of 26 letters, the set of 10 digits, or the set of 4 special characters.image text in transcribed

8. How many permutations of the 10 digits are there with 2 preceding 7 and 3 preceding 1? Preceding is not necessarily directly preceding. 9. How many bit strings of length 12 contain at least three 1-s 10. How many anagrams of "abracadabra" are there

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