What is the probability of picking an ace from a deck of cards, then another ace without replacement?

What is the probability of picking an ace from a deck of cards, then another ace without replacement?

Approach: Multiply P(A) * P(B|A).

1/221. (4/52) * (3/51) = (1/13) * (1/17) = 1/221.

Follow-up: What if the first card is replaced?

Key concepts: sampling without replacement.