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From: no5db@ihuxl.UUCP
Newsgroups: net.math
Subject: Re: interesting division by three property
Message-ID: <520@ihuxl.UUCP>
Date: Mon, 29-Aug-83 09:01:14 EDT
Article-I.D.: ihuxl.520
Posted: Mon Aug 29 09:01:14 1983
Date-Received: Tue, 30-Aug-83 00:59:19 EDT
References: <270@aplvax.UUCP>
Organization: BTL Naperville, Il.
Lines: 7


	A number is divisible by seven if you can multiply the last digit
in the number by 2, strip that digit off the number and then subtract
the remaining number from the product and get a number divisible by 7.
For example, 154, 4 x 2 = 8, 8 - 15 = -7, 154 is divisible by 7.

				Lance