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Find the number of passwords that use each of the digits 3,4,5,6,7,8,9 exactly once. IN how...

Find the number of passwords that use each of the digits 3,4,5,6,7,8,9 exactly once. IN how many of the passwords:

1. are the four odd digits consecutive?

2. are no two odd digits consecutive?

3. are the first three digits even?

4. are the three even digits consecutive?

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