ok here is what you need to know
probability is best found as a fraction what you want/total outcomes
if you have two events that occur together, multiply the probability of each
 deck of cards  52 cards total
 13 hears, 13 diamonds, 13 spades and there are 13 clubs these are your suits.
 each suit has #'s from 210, a jack, a queen, a king and an ace
a) both are diamonds
there are 13 diamonds & 52 cards total so that would be 13/52
now the card that you drew is in your hand, so there are 51 cards on the table to pick, and there are only 12 diamonds left bc we have to pretend that the one you picked up is a diamond
that gives us 12/51
so do 13/52 x 12/51 = 3/51
9/28/2013

Justin L.