Geometry

Question Analysis
This question calculates probability for mutually exclusive card ranks.

Key Concept Explanation
Mutually Exclusive Ranks: A card cannot be both a 7 and an 8.
Probability Formula: P(A or B) = P(A) + P(B).

Step-by-Step Solution
Total cards = 52
Number of 7s = 4 → P(7) = 4/52 = 1/13
Number of 8s = 4 → P(8) = 4/52 = 1/13
P(7 or 8) = 1/13 + 1/13 = 2/13
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