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Intern
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Joined: 01 Aug 2003
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Ps [#permalink] New post 04 Sep 2003, 13:08
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1) Flip coin five times, what is the probiility of first three face up and last two face down?

2) Phone number is compsed with 3, 3, 4, 5, how many phone numbers do we have?
Senior Manager
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 [#permalink] New post 04 Sep 2003, 17:03
1) (1/2)^3 * (1/2)^2 = 3.12%

2) Do you mean how many 4 digit numbers can be formed with those 4 numbers ? In that case: 4!
Manager
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 [#permalink] New post 04 Sep 2003, 19:05
1) I would say 9/64. Because for the probability for a heads every time is (1/2) but when you ask for it in a 3 times in row then (1/2) * (1/2)^2 * (1/2)^3. Same with the tales...

result:
1/64 + 1/8 = 9/64.


2) If you mean 7 digit numbers then the answer is 728. If you mean 4 digit number then answer is 8.
Manager
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 [#permalink] New post 04 Sep 2003, 21:07
1. (1/2)^5

2. If you mean four digit number then its 4!/2! = 12
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Sept 3rd

  [#permalink] 04 Sep 2003, 21:07
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