The answer depends on what you are selecting from. If you are selecting months in which the equinoces occur, the probability is 0.5
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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.
Theoretical