[" 47.If "x=1+a+a^(2)+a^(3)+......oo],[y...

[" 47.If "x=1+a+a^(2)+a^(3)+......oo],[y=1+b+b^(2)+b^(3)+.........oo],[" then "1+ab+a^(2)b^(2)+a^(3)b^(3)+......oo],[" (a) "(xy)/(x+y-1)(b)(x+y)/(x+y+1)(c)(x-y)/(x-y+1)(d)],[(xy)/(x-y-1)]

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