Homework Help: math

Posted by ken on Saturday, October 18, 2008 at 9:10pm.

how many 7 digit numbers can be formed with the numbers 1, 2, 4, 7. (they are in brackets). the question wants two parts. (a) if the numbers can be repeared and (b) if repetation is not allowed

math - drwls, Sunday, October 19, 2008 at 6:22am
Any of 4 numbers can be selected 7 times in a row. The answer is 4^7 = 16,384

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