Astandard 52 card deck of cards is shuffled and then a 12-card hand is dealt from the deck. how many different outcomes are possible that have exactly 3 pairs, and all other cards of different denominations?

Consider u = {x|x is a negative real number}which is an empty set? o {x|x eu and x has a negative cube root}o {x|x eu and x has a negative square root}{x|x eu and x is equal to the product of a positive number and -1}{x|x eu and x is equal to the sum of one negative and one positive number?