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Let S be the set of positive integral values of a for which ( ) 32 x 8 x 4 a 9 x 1 a 2 ax 2 2 + − + + + + < 0, ∀ x ∈ R. Then, the number of elements is S is :

1. 0
2. ∞
3. 3
4. 1

Correct answer: 0

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