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

If the equation `x^(4)-4x^(3)+ax^(2)+bx+1=0` has four positive roots, find the values of a and b.

A

roots are in A.P

B

`a+b = 2`

C

`ab = - 24`

D

the equation `ax^(2)+bx-2 =0` has rational roots

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The correct Answer is:
A, B, C, D
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