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

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Joined: 27 May 2014
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John wrote a phone number on a note that was later lost. John can  [#permalink]

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30 Sep 2014, 02:13
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Question Stats:

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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! :!: :!:

--== Message from the GMAT Club Team ==--

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This discussion does not meet community quality standards. It has been retired.

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John wrote a phone number on a note that was later lost. John can  [#permalink]

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08 Mar 2018, 11:37
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]

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08 Mar 2018, 12:02
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! :!: :!:

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.

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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Re: John wrote a phone number on a note that was later lost. John can &nbs [#permalink] 08 Mar 2018, 12:02
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