A: Let p = 2 and l = 13. Then l = 0 when p = 3 or 7. Similarly for p = 5, 6 or 9. Similarly for p = 8, 9 or 10. Hence l = 0 when p = 4 or 7. Hence l = 0 when p = 5 or 6. The answer is (B).
Answer the following multiple choice question with options (a), (b), (c), (d), (e) by reasoning step-by-step.
Q:If p^2 – 13p + 40 = l, and p is a positive integer between 1 and 10, inclusive, what is the probability that l < 0? Answer Choices: A)1/10 B)1/5 C)2/5 D)3/5 E)3/10