Radius of Gyration of an H-polymer?

Sep 2019
Hello, I've been struggling with determining the radius of gyration of an H-polymer.

Show that the radius of gyration of an ideal H-polymer with all five sections containing an equal number (N/5) of Kuhn monomers of length b is:

(R_g)^2 = (Nb^2/6)(89/625)

I know the definition of the radius of gyration, but I've been having a difficult time deducing this particular equation from there.

Any help is appreciated.
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