Assume that a standard deck of 52 playing cards is randomly shuffled and the first 2 cards are dealt with you.  What is the probability that you have a blackjack?  It doesn't matter which card was first so there are two ways to have a blackjack.  One is to get the ace first and the 10-point card second.  The other way is to get the cards in reverse order.  There are 4 aces and 16 of the 10-point cards.

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