For a positive base ten integer of the form ABCD drawn at random between 1111 and 9999 inclusively, determine the probability that ABCD is divisible by each of AB, AC, AD, BD and CD; but, not divisible by BC.

Note: Each of the letters in bold represents a digit from 1 to 9, whether same or different.

(In reply to re(2): ABACADABrA (Solution) by ed bottemiller)

No I meant what I posted it was just a silly mistake on my part.  I realized it only when I thought about it while driving around this evening.

Posted by Jer on 2010-10-20 01:30:59