Answer:
27/1444
Explanation:
there are 10 odd numbered cards and 3, 9, 15 are divisible by 3. also, 6, 12, 18 are divisible by 3.
P(1st card is odd and divisible by 3) = 10/20 X 6/20 = 60/400
now we have 19 cards remaining. we have 10 even numbered cards and 9 odd numbered cards. there are
P(2nd card is odd and divisible by 3) = 9/19 X 5/19 = 45/361
P(both cards are odd and divisible by 3) = 60/400 X 45/361 = 27/1444