Two cards are randomly chosen without replacement from an ordinary deck of 52 cards

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1

Two cards are randomly chosen without replacement from an ordinary deck of 52 cards. Let B be the event that both cards are aces, let AS be the event that the ace of spades is chosen, and let A be the event that at least one ace is chosen.

Find
(a) P(B/AS)
(b) P(B/A)