How are the group numbered regarding the modern version of Mendeleev's periodic table?

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Solution

There are eight groups, starting from group I to group VII.
Each of these groups is again divided into two subgroups, A and B.
All elements of a sub group have similar properties and show same valency, which is equal to the group number.

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Answer the following question regarding the modern version of Mendeleev's periodic table.

Name the total number of groups which are further subdivided into subgroup A and B.

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