Powderhorn@beehaw.org to Technology@beehaw.orgEnglish · 2 months agoThe Math Hack You Didn’t Know Was in Your Credit Cardwww.scientificamerican.comexternal-linkmessage-square7linkfedilinkarrow-up138arrow-down15file-text
arrow-up133arrow-down1external-linkThe Math Hack You Didn’t Know Was in Your Credit Cardwww.scientificamerican.comPowderhorn@beehaw.org to Technology@beehaw.orgEnglish · 2 months agomessage-square7linkfedilinkfile-text
I’ve been familiar with the concept, but this is by far the best behind-the-scenes explanation I’ve seen.
minus-squarecmnybolinkfedilinkEnglisharrow-up5·2 months agoThe check digit is to catch a mistyped number.
The check digit is to catch a mistyped number.