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Preliminary Exam CSAT October 21

1. There are 10 identical coins and each one of them has ‘H’ engraved on its one face and ‘T’ engraved on its other face. These 10 coins are lying on a table and each one or them has ‘H’ face as the upper face. In one attempt, exactly four (neither more nor less) coins can be turned upside down. What is the minimum total number of attempts in which the ‘T’ faces of all the 10 coins can be brought to be the upper faces?

(a) 4 (b) 7 (c) 8 (d) Not possible

General Studies

Political Science and International Relations

Sociology

Some Reference Essays

List of previous year essay topics (1997-2019)

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