I did this quickly but I think these are the answers
1. Ways to get all 3 digits the same: 9 ways (1+1+1+1+1+1+1+1+1)
Total: 9^3 (9x9x9)
Hence probability = 9/9^3= 1/9^2=1/81
2. Total ways to draw 5 cards from 52 = 52C5
Ways to get at least 3 aces:
Case 1 (3 aces): 4C3*48C2/52C5
Case 2 (4 aces)...