Given that exactly two of the six rolls resulted in a 1, find the probability that the first roll resulted in a 1. Note: Your answer should be a number. Do not enter "!" or combinations in your answer.
We are told that exactly three of the rolls resulted in a 1 and exactly three rolls resulted in a 2. Given this information, find the probability that the six rolls resulted in the sequence (1,2,1,2,1,2). Note: Your answer should be a number. Do not enter "!" or combinations in your answer.