What is the rationale for df = (r - 1)(c - 1)in conducting a chi-square test of independence for a contingency table with r rows and c columns?

Name: What is the rationale for df = (r - 1)(c - 1)in conducting a chi-square test of independence for a contingency table with r rows and c columns?
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The Answer of What is the rationale for df = (r - 1)(c - 1)in conducting a chi-square test of independence for a contingency table with r rows and c columns?

What Is the Rationale for Df = (R - 1)(c