Q: 88 (CAPF/2012)

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10 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?
question_subject: 
Maths
question_year: 
2012
question_exam: 
CAPF
stats: 
0,136,112,136,40,72,0