What this probability question tests
This is a medium-difficulty probability question that appears in quant interviews to assess how candidates think about compound events and parity. Rather than relying on brute-force enumeration, the cleanest approach uses logical reasoning about when a product is even versus odd.
The problem rewards candidates who recognize that a product's parity depends on the parity of its factors, and who can therefore rephrase the question in simpler terms. This kind of insight—reframing a problem to avoid unnecessary computation—is valued across trading desks and quant shops.
- Parity reasoning and divisibility
- Independence and complement events
- Simplifying probability via logical structure rather than enumeration