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If x +1/x = a,x^2 + 1/x^3 = b, then x^3 + 1/x^2 is-

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If x +1/x = a,x2 + 1/x3 = b, then x3 + 1/x2 is-

(A) a3 + a2 – 3a – 2 – b 

(B) a3 – a2 – 3a + 4 – b 

(C) a3 – a2 + 3a – 6 – b 

(D) a3 + a2 + 3a – 16 – b

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Correct option(A) a3 + a2 – 3a – 2 – b
 Explanation:

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