1st question, find the days for each month. For example:
Digital display of Jan is 202301xx, you need 1 & 3 =>20230113, 20230131
2nd question, the following cases make the total add up to 3:
1. Roll a 3 the 1st time, probability= 1/6
2. Roll 1,2 or 2,1, probability = 1/6*1/6*2
3. Roll 1,1,1, probability = 1/6*1/6*1/6
Add up the above 3 probabilities.
