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If s1,s2,s3.........sr are the sum of th...

If `s_1,s_2,s_3.........s_r` are the sum of the products of the roots taken `'r'` at a time then for `x^5 - x^2 + 4x - 9 = 0 => s_3 +s_4 - s_5 =`

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