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If "l" is the length of intercept made b...

If "l" is the length of intercept made by a common tangent to the circle "`x^(2)+y^(2)=16`" and the ellipse "`(x^(2))/(25)+(y^(2))/(4)=1`," on the coordinate axis, then the value of "`3l^(2)`" is

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