Probability

Concept:The probability of at least one success in two independent trials equals 1 minus the probability of no success in both trials.Explanation:We roll a fair die twice."At least one spot" means at least one roll shows the face with one dot (i.e., number 1).Total possible outcomes: $6 \times 6 = 36$.Number of outcomes with no 1 on either roll: $5 \times 5 = 25$.Number of outcomes with at least one 1: $36 - 25 = 11$.Thus, probability = $\frac{11}{36}$.Answer:The correct option is A: $\frac{11}{36}$.