50/50
or 1 in 2
as in could be either red or black
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0.5
26/52
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.
Excluding jokers, the probability is 1 in 2.
There are 52 cards of which 26 (a half) are black. So he probability that the first card is black is 26/52= 1/2