Final answer:
The probability of winning at least once is 1 - 0.2824 = 0.7176 or 71.76%. To find the probability of winning at least once in 12 months, we can use the complement rule. The probability of not winning in one month is 1 - 0.10 = 0.90.
Step-by-step explanation:
To find the probability of winning at least once in 12 months, we can use the complement rule. The probability of not winning in one month is 1 - 0.10 = 0.90. Since the months are independent, the probability of not winning in 12 months is 0.9012 = 0.2824. So, the probability of winning at least once is 1 - 0.2824 = 0.7176 or 71.76%.