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proasp_codeclinic thread: numbers which use a "double-add-double MOD 10" check digit

Message #1 by dont worry <aspmailbox@y...> on Wed, 21 Nov 2001 11:42:33 -0800 (PST)
Can some one explain "numbers which use a
"double-add-double MOD 10" check digit" in regards to
checking to see if a credit card number is valid?

P.S. Special thanks to everyone that answers the
questions on this forum.  Have a good one!

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