Moe 0 Light Poster

I have been studying that question and try to answer.

Consider a LAN to which 10 host interfaces and three routher interfaces are attached.Suppose all three LANs use class C addresses.The IP addresses for the 13 devices will be identical in which of the firsr 32 bits?

The correct answer of that question is 24.
Can someone please explain me how can that answer be got?

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