How a Jodi Family Is Made
Take jodi 12. The cut of 1 is 6 and the cut of 2 is 7, so the digits can be 1 or 6, and 2 or 7: 12, 17, 62, 67. Reverse each one: 21, 71, 26, 76. These 8 jodis are one family.
10 families have 8 jodis. The other 5 are the red jodi families — doubles like 11 and cut pairs like 16 — which have only 4 jodis each, because reversing them gives a jodi already in the family.
Family jodi chart — FAQ
What is a family jodi?
A family jodi (FM jodi) is the set of jodis made from one jodi by using each digit or its cut (0↔5, 1↔6, 2↔7, 3↔8, 4↔9) and by reversing the pair. Jodi 12's family is 12, 17, 21, 26, 62, 67, 71 and 76.
How many jodis are in a family?
8 jodis, except the red jodi families (doubles and cut pairs such as 11, 16, 61, 66), which have 4.
How many jodi families are there?
All 100 jodis make 15 families: 10 of 8 jodis and 5 red families of 4.
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