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

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Find the number of passwords that use each of the digits3,4,5,6,7,8,9 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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