When the Sun Becomes an AGB Star,its Radius Will Be $\bigodot$

When the Sun becomes an AGB star,its radius will be approximately 100 R _$\bigodot$ .If its mass at this point will be approximately the same as it is now,how will its surface gravity as an AGB star compare to its present surface gravity as a main-sequence star? Note that g = GM/R².

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Surface gravity: g = GM/R² g_MS/g_AGB = (R_AGB/R_MS)² = ...

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