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Eduncle Best Answer
Here In Routing table entries are according to 3-level Hierarchy.
At Level 1 : All routers within the regions will store the address of all other routers. So total 10 entries.
At Level 2 : Table entries will also include entries for all regions excepting itself. So, 8 entries will be there for Regions.
At level 3 : Table entries will also include entries for all clusters excepting itself. So, 7 entries will be there for Regions.
Total Entries in Routing Table = 10 + 8 + 7 = 25.