CAT 2025 Unknown Topic Question (Hard)

Question

A consignment of 15 wrist watches contains 4 defectives. The wrist watches are selected at random, one by one, and examined. The ones examined are not replaced back. What is the probability that the ninth one examined is the last defective?

Optima Learn · Accepted Answer

To find this probability, we need the chance that the 9th watch examined is the last 4th defective found. Understanding the setup 15 watches, 4 defective, drawn one by one without replacement we want P the 9th draw is the 4th and final defective . Analyzing the Calculation This requires exactly 3 de

CAT 2025 Quantitative — Previous Year Question

CAT 2025

Quantitative

Unknown Topic

Hard

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