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John wrote a phone number on a note that was later lost. John can

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adiideas
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John wrote a phone number on a note that was later lost. John can [#permalink] New post   30 Sep 2014, 03:13
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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

Above question, which is from question bank shared on forum itself, is quite difficult. Can someone explain multiple solutions with detailed inputs?

Probability is tough nut to crack! :!: :!:

Appreciate your help



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Re: John wrote a phone number on a note that was later lost. John can [#permalink] New post   08 Mar 2018, 12:37
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Moving to the better forum. Thanks!
Moderators, Feel free to delete this note after replying.
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Re: John wrote a phone number on a note that was later lost. John can [#permalink] New post   08 Mar 2018, 13:02
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adiideas wrote:
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

Above question, which is from question bank shared on forum itself, is quite difficult. Can someone explain multiple solutions with detailed inputs?

Probability is tough nut to crack! :!: :!:

Appreciate your help


Discussed here: john-wrote-a-phone-number-on-a-note-that-was-later-lost-94787.html In case of any questions please post in there.

Also, please follow the rules when posting a question. Thank you.



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
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Re: John wrote a phone number on a note that was later lost. John can [#permalink]
08 Mar 2018, 13:02
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