2012 · Q88
Ten identical coins are lying on a table having head 'H' face as the upper face. In one attempt, exactly four coins can be turned upside down. What is the minimum total number of attempts in which tail 'T' face of all the 10 coins can be brought to be the upper face?
general-mental-abilitylogical-reasoning
- A4
- B5
- C6
- D7
Explanation
Four attempts suffice - e.g. flip coins 1-4, then 7-10, then 2-5, then 2,3,4,6 - and 3 is not among the options, so 4 is the minimum available answer.