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Why is the basic strategy for one deck different than for multiple decks? If Im not counting cards, what difference does it make?

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Why is the basic strategy for one deck different than for multiple decks? If Im not counting cards, what difference does it make?

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The answer has to do with the fact that once a card is played it has an impact on the distribution of the remaining cards. For example the single deck basic strategy calls for standing on two sevens against a ten, with two more decks the player should hit. In the situation with one deck the probability of drawing a third seven on the third card is only 2/49, or 4.08%. With two decks this probability rises to 6/101 or 5.94%. With the lower probability of catching a 3-card 21 in single deck (the only total that can beat a dealer 20) the best play is to stand. The effect of removing a single card increases as the number of decks decreases.

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