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Intern
Joined: 01 Aug 2003
Posts: 7

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Location: Ann Arbor

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04 Sep 2003, 14:08
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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?

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Senior Manager
Joined: 22 May 2003
Posts: 328

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Location: Uruguay

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04 Sep 2003, 18:03
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!

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Manager
Joined: 26 Aug 2003
Posts: 232

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Location: United States

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04 Sep 2003, 20:05
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.

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Manager
Joined: 10 Jun 2003
Posts: 209

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Location: Maryland

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04 Sep 2003, 22:07
1. (1/2)^5

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

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04 Sep 2003, 22:07
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