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The set of values of a for which the inequality, `x^2 + ax + a^2 + 6a < 0` is satisfied for all `x belongs (1, 2)` lies in the interval:

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The set of values of a for which the inequality, `x^2 + ax + a^2 + 6a < 0` is satisfied for all `x belongs (1, 2)` lies in the interval:
A. (1,2)
B. `[1,2]`
C. `[-7,4]`
D. none of these
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Correct Answer - D
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