The unrestricted geometric double sum is (Σ_(x≥0)2^(−x−1))²=1. The removed diagonal sum is Σ_(x≥0)2^(−2x−2)=1/3. Normalization gives c(2/3)=1,so c=3/2>1. Independence fails because all diagonal probabilities vanish while the marginals are positive there. **C**.
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