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Prob & Comb mix- solve using Bernoulli Theorem

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Intern
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Joined: 17 Feb 2008
Posts: 28
Prob & Comb mix- solve using Bernoulli Theorem [#permalink]

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New post 10 Mar 2009, 23:16
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

25. John wrote a phone number on a note that was later lost. John can remember that the number had 7 digits, the digit 1 appeared in the last three places and 0 did not appear at all. What is the probability that the phone number contains at least two prime digits?

a) 15/16
b) 11/16
c) 11/12
d) ½
e) 5/8


----------------------------------------
The answer is 11/16, but I cant seem to get it using bernouli theorem:

P^s(1-P)^n-s nCr

Words: Prob of success x 1 - prob of failure x combinations

Can someone please solve using this method or show me a simpler way and please dumb it down... Cheers
Intern
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Joined: 03 Jan 2009
Posts: 11
Re: Prob & Comb mix- solve using Bernoulli Theorem [#permalink]

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New post 11 Mar 2009, 06:50
25. John wrote a phone number on a note that was later lost. John can remember that the number had 7 digits, the digit 1 appeared ONLY in the last three places and 0 did not appear at all. What is the probability that the phone number contains at least two prime digits?


Try now... you will get the answer you are looking for
Re: Prob & Comb mix- solve using Bernoulli Theorem   [#permalink] 11 Mar 2009, 06:50
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Prob & Comb mix- solve using Bernoulli Theorem

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