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OpenStudy (anonymous):
How many 4-digit numbers can be formed from digits 6, 5, 4, 3, 2, 1, and 7: (a) If repetition is not allowed? (b)If repetition is allowed? (c)How many are even if repetition is not allowed? (d)How many are odd if repetition is not allowed?
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OpenStudy (anonymous):
|dw:1381037652533:dw|
OpenStudy (anonymous):
|dw:1381037697836:dw| Got it so far?
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