Ten identical coins are lying on having head lsquo H rsquo face as the upper face In one attempt exa...........

Quantitative Aptitude( Paper-I ) Probability

Ten identical coins are lying on having head ‘H’ face as the upper face. In one attempt, exactly 4 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?

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Explanation:

It can be done in four moves.
initial situation: H H H H H H H H H H
1ST MOVE: T T T T H H H H H H
2ND MOVE: T T T T H H T T T T
3RD MOVE: T H H H T H T T T T
4TH MOVE: T T T T T T T T T T