The probability is one half.
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There are 26 black cards in a deck of cards (13 spades and 13 clubs) There are 52 cards total in a deck of cards Therefore, the probability of drawing a black card from a deck of 52 cards: 26/52 0.5
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).
The probability of drawing a pair from a standard deck of 52 cards is 3 in 51, or 1 in 17, or about 0.0588.
There are four 3 cards in the deck of 52 cards. So the probability of drawing a 3from the deck of cards is; P(3) =4/52 =0.076923076... ~ 0.0769 ~ 7.69%.
The probability of drawing a red or black card from a standard deck of playing cards is 1 (a certainty). This is because these are the only options available.