2. How many different 3-digit numbers can be formed from 0, 1, 4, 6, and 8 if a. no repetition is allowed? b. repetition is allowed? c. repetition is allowed but all numbers formed are odd? d. repetition is allowed but all numbers formed are even?
Added by Martin B.
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If no repetition is allowed, we have 5 choices for the first digit, 4 choices for the second digit (since we can't repeat the first digit), and 3 choices for the third digit (since we can't repeat any of the previous digits). Show more…
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