Probability

[Awuah29]

Take a look at this. Anyone knows how to solve this??

Two cards are drawn random from an ordinary deck of 52 cards. Determine the probability that both cards are aces if

a) the first card is replaced before the second card is drawn.

b) the first card is not replaced before the second card is drawn

Answer for a= 0.006 b) 0.005

How do they get this??

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[Streetwolf]

Take a look at this. Anyone knows how to solve this??

Two cards are drawn random from an ordinary deck of 52 cards. Determine the probability that both cards are aces if

a) the first card is replaced before the second card is drawn.

b) the first card is not replaced before the second card is drawn

Answer for a= 0.006 b) 0.005

How do they get this??

a) 4/52 * 4/52 = 0.006
b) 4/52 * 3/51 = 0.005