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30. Sum ine series 4 4.6 4.6.8 57. If a,...

30. Sum ine series 4 4.6 4.6.8 57. If a, b, c are positive real numbers, then prove that [(1 + a)(1+bX1 + 0)]]> 7a*b*ct. [JEE 2004, 4M) Find the conditions on a and Bifxx.x, satisfying the cubic x1 - x + ax+B=0 are in A.P. 58.

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