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The holographic bound has been extended to the different theory of gravities such as scalar-tensor gravity and $f(R)$ gravity according to the Noether charge definition of the entropy for a black hole surface. We have introduced some popular examples of the flat FRW cosmology in order to investigate holographic bound in scalar-tensor and $f(R)$ gravities. Using the holographic bound, we put an additional constraint on the scalar-tensor gravity and $f(R)$ gravity parameters.
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