On the table are given 5 coins with 'heads' up. Each turn you can turn 3 coins on the
other side. What is the least possible number of turns so that all coins would be
'tails' up?
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14
Answer:
2/5 is the least possible no of turns so tails up
Answered by
6
- In this case we are flipping 5 coins
- => so the number of possibilities is:
- 2 x 2 x 2 x 2 x 2 = 32.
- (Whew!) As you can count for yourself, there are 10 possible ways to get 3 heads.
- Thus, the probability of getting 3 heads from 5 coin flips is: 10/32, or 5/16.
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