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UPSC 2002: A complete cycle of a traffic light takes 60 seconds. During each cycle the light is green for 25 seconds, yellow for 5 seconds and red for 30 seconds. At a randomly chosen time, the probability that the light will not be green is
(a)1/3
(b)1/4
(c)5/12
(d)7/12
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Not attemptedCorrect Answer: (d) 7/12
A full cycle is 60 s, of which the light is green for 25 s. Hence it is not green (yellow + red) for 60 − 25 = 35 s. The probability = 35/60 = 7/12. Options a–c correspond to 20 s, 15 s and 25 s of non-green time and so are wrong. ([licchavilyceum.com](https://licchavilyceum.com/upsc-civil-services-prelims-2002-solved-question-paper/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2002 Science & Technology question?▼
The correct answer is option (d): 7/12. 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 2002, GS Paper 1, as Question 1. It falls under Science & Technology > Quantitative Aptitude.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
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.