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The probability of drawing one black seven from a standard deck of cards is 2/52 = 1/26. The probability of drawing the other black seven from the remaining 51 cards is 1/51. Therefore the probability of drawing both black sevens from a deck of cards = 1/26 x 1/51 = 1/1326 ~ 0.000754 (3sf).
There are infinite possible answers. 14/26 is one. 0.538461(repeating) is another possible solution.
26 = 26
26 as an improper fraction is simply 26/1
26 divided by two is equal to 13