Answer: 3/40
Step-by-step explanation:
Number of A's = 4
Number of B's = 5
Number of C's = 6
Number of D's = 5
Total number of letters tiles = 20
Probability of selecting C = 6/20 = 3/10
Probability of selecting D = 5/20 = 1/4
P( C and D)= 3/10 × 1/4 = 3/40
