CMR: A=1/1.2.3+1/2.3.4+1/3.4.5+...+1/18.19.20 <1/4 CMR: A=1/5+1/5^2+1/5^3+1/5^99 <1/4 CMR: D=36/1.3.5+36/3.5.7+36/5.7.9+...+36/25.27.29 <3

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