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If x^4 -16 x^3 +86 x^2 - 176 x +105 =...

If `x^4 -16 x^3 +86 x^2 - 176 x +105 =0` then find` s_1 ,s_2 ,s_3,s_4`

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The correct Answer is:
`1,3,5,7`
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