Geometry

Question Analysis
This question tests understanding of mutually exclusive and exhaustive events in probability calculation.

Key Concept Explanation
Mutually Exclusive & Exhaustive: The events "winning ticket" and "losing ticket" cannot occur together (mutually exclusive) and cover all possible outcomes (exhaustive).
Probability Formula: P(A or B) = P(A) + P(B) when events are mutually exclusive.

Step-by-Step Solution
Total tickets = 15 (6 winning + 9 losing)
P(Winning) = 6/15 = 0.4
P(Losing) = 9/15 = 0.6
P(...