A standard deck of 52 cards contains 13 cards each from the four suits: spades, clubs, diamonds and hearts. If two cards are randomly picked without replacement, what is the probability that they are both diamonds?

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Correct Answer: **C.** *(13×12)/(52×51)*

The number of ways 2 cards can be chosen from 52 is (52¦2) = (52×51) / 2, and the number of ways 2 cards can be picked from 13 diamonds is (13¦2) = (13×12) / 2. The ratio of the latter to the former is the required probability.

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