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November 23, 2014

November 23, 2014

Posted by **mmima** on Wednesday, October 7, 2009 at 6:45pm.

- maths -
**jim**, Wednesday, October 7, 2009 at 8:05pmI don't see a short-cut. Could this just be division practice?

I make it two such numbers of 24 possibilities, one of which is 4186, and the other is predictable from that because 8 mod 7 = 1, and the equation (1000a + 100b + 10c + d = 0 mod 7) works out to (6a + 2b + 3c + d = 0 mod 7). But I still don't quite understand the intent behind the question. Maybe I'm missing something.

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