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UPSC 1995: One of the drawers is opened at random and a coin is drawn. It is found to be a silver coin. What is the probability that the other coin in the drawer is a gold coin?
(a)0.25
(b)1.00
(c)0.50
(d)0.60
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Not attemptedCorrect Answer: (c) 0.50
There are three drawers: SS, GG and SG. Drawing a silver coin rules out the GG drawer; the coin must have come from either SS or SG (2 equally likely drawers). Only in drawer SG is the remaining coin gold, giving a probability 1⁄2 = 0.50. ([licchavilyceum.com](https://licchavilyceum.com/upsc-civil-services-prelims-1995-solved-question-paper/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 1995 Science & Technology question?▼
The correct answer is option (c): 0.50. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Quantitative Aptitude question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 1995, GS Paper 1, as Question 142. It falls under Science & Technology > Quantitative Aptitude.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Quantitative Aptitude?▼
UPSC has asked 178 questions from Quantitative Aptitude (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.