[" 4.If "x=1+a+a^(2)+a^(3)+........." to...

[" 4.If "x=1+a+a^(2)+a^(3)+........." to "alpha;quad y=1+b+b^(2)+b^(3)+.........." to "oo" ; Find the sum of the series "],[+ab+(ab)^(2)+(ab)^(3);" where,"|a|<1" and "|b|<1" ."]

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