total cards=52
balck cards=26
So
P(Black)=total balck/total cards
P(Black)=26/52=1/2
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The probability is 0.4231, approx.
The probability of selecting a red card is 26 in 52 or 1 in 2. The probability of selecting an even card is 20 in 52 or 5 in 13. The probability, therefore, of selecting a red even card is 1 in 2 times 5 in 13 or 5 in 26.
The probability is 6/52 = 3/26.
From a 52 card deck, probability is 1/52.
It is 3/13. The fact that the card is black makes no difference since the probability is the same for both colours.