Dhruba Dasgupta
Dhruba Dasgupta
8 years ago

If the roots of the equation px^3-20x^2+4x-5=0,where m is not equal to 0,are l,m and n,then what is the value of 1/lm+1/mn+1/ln

A. 5

B. -4

C. 4

D. 8


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