Using the digits 1, 2, 3, 7, 8, 9, how many 4-digit numbers can be formed when repetition is not allowed (digits cannot be repeated) and the number must be odd?
Added by Josefina A.
Step 1
Since the number must be odd, the last digit must be either 1, 3, or 9. Therefore, there are three choices for the last digit. For the first position, any of the remaining five digits can be used, so there are five choices. Show more…
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