Each card bears an English alphabet.
∴ n(S) = 26
Let A be the event that the card drawn is a vowel card.
There are 5 vowels in English alphabets.
∴ A = {a, e, i, o, u}
∴ n(A) = 5
∴ P(A) = \(\frac{n(A)}{n(S)}\) = 5/26
∴ The probability that the card drawn is a vowel card is 5/26.