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이전 표현에서는 (8.20)식이 a와 b가 독립이면 성립하는 것으로 오해할수 있다. 원문을 보면 (8.20)식은 결국 c가 조건으로 주어졌을때 a와 b가 통계적 독립일 경우로 설명하고 있다.