Mathematics · Probability
If l, m represent any two elements (identical or different) selected with replacement from the set {1, 2, 3, 4, 5, 6, 7}, then the probability that lx2 + mx + 1 > 0 ∀ x ∈ R is:
- 13672
- 2107C2
- 32272✓
- 4127C2
Correct answer
2272
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