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A circular dart board of radius 5cm is hung on a wall. Pete

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A circular dart board of radius 5cm is hung on a wall. Pete [#permalink] New post 13 Mar 2004, 15:31
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A circular dart board of radius 5cm is hung on a wall. Pete thros a dart from a distance of 10m and the dart hits the board. What is the probability that the dart hit the board within 1cm from the centre?
(10cm = 1 decimetres, 10 decimetres = 1m)

1/5
1/25
1/2^5
:evil:
Cannot be determined
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 [#permalink] New post 13 Mar 2004, 22:20
The total area of the dart board is 25*Pi.
Area of the dart board with radius 1cm is Pi.
Now the probability that the dart hit the board within 1cm from the centre will be Pi/ 25Pi.
So the answer is 1/25.

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 [#permalink] New post 17 Mar 2004, 04:54
A professional can hit the bulls eye all the time, whereas a novice through
results in random hit. We don't know wheather Pete is a professional or novice?

Thus, we can't determine the probability of the event!
  [#permalink] 17 Mar 2004, 04:54
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A circular dart board of radius 5cm is hung on a wall. Pete

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