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If the equation of chord ofthe ellipse "`(x^(2))/(25)+(y^(2))/(16)=1`" joining "],[" the two points "`P((pi)/(3))`" and `Q((pi)/(6))`" on it is "`(x)/(lambda_(1))`+`(y)/(lambda_(2))`=`(sqrt(3)+1)/(2)`],[" then "`20 lambda_(1)`+`25 lambda_(2)`="

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