Final answer:
The probability of randomly choosing a card with one of the first 5 letters of the alphabet or a vowel is 7/26.
Step-by-step explanation:
To find the probability of randomly choosing a card with one of the first 5 letters of the alphabet or a vowel, we need to find the number of favorable outcomes and divide it by the total number of possible outcomes. There are 5 letters in the first 5 letters of the alphabet and 5 vowels, with 3 letters (a, e, i) overlapping between the two sets. Therefore, the number of favorable outcomes is 5 + 5 - 3 = 7. The total number of cards is 26. So, the probability is 7/26.