4 cards. The probability of picking the 6 would be 1/4 ( 1 out of 4 cards)
After the first card is picked you have 3 cards left, 2 are less than 6, so you would have a 2/3 Probability.
The probability of both happening is:
1/4 x 2/3 = 2/12 = 1/6
The answer is 1/6