UPSC 1997: A survey was conducted on a sample of 1000 persons with reference to their knowledge of English, French and German. The results of the survey are presented in the given Venn diagram. The ratio of the number of persons who do not know any of the three languages to those who know all the three languages is

The correct answer is option (b): 1/25. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.

This question was asked in UPSC CSE Prelims 1997, GS Paper 1, as Question 148. It falls under Science & Technology > Quantitative Aptitude.

This question is rated "moderate". It requires sound conceptual understanding of the topic.

UPSC has asked 164 questions from Quantitative Aptitude (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.