The ace is high or low not by deck, but is determined by the game rules, or if not defined there, then it is agreed upon by the players pre-game.
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The probability of drawing an Ace from a standard deck of 52 cards is 4 in 52, or 1 in 13.
The probability of not drawing an Ace from a standard deck of 52 card is 48 in 52 or 12 in 13, or about 0.9231.
The probability of drawing an ace and then a seven from a standard deck of 52 card is (4 in 52) times (4 in 51), or 16 in 2652, or 4 in 663, or about 0.006033.
The probability of drawing a Ace from a standard deck of 52 cards if one Ace is missing is 3 in 51, or about 0.05882. If the missing card is not an Ace, then the probability is 4 in 51, or about 0.07843.
It is 11/13.