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[" If "a=sum(n=0)^(oo)x^(n),b=sum(n=0)^(...

[" If "a=sum_(n=0)^(oo)x^(n),b=sum_(n=0)^(oo)y^(n),c=sum_(n=0)^(oo)(xy)^(n)" where "|x|,|y|<1;" then- "],[[" (A) "abc=a+b+c," (B) "ab+bc=],[" (C) "ac+bc=ab+c," (D) "ab+ac=]]

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