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if the equation x^(4)-4x^(3)+ax^(2)+bx+1...

if the equation `x^(4)-4x^(3)+ax^(2)+bx+1=0` has four positive roots, then find a.

A

(1, 3)

B

(6, -4)

C

(4, 2)

D

none of these

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The correct Answer is:
B
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