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15 computers in the corporate network are infected with

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VP
VP
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Joined: 05 Jul 2008
Posts: 1402

Kudos [?]: 443 [0], given: 1

15 computers in the corporate network are infected with [#permalink]

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New post 09 May 2009, 16:35
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15 computers in the corporate network are infected with virus. If every day several computers are arbitrarily selected for scanning, what is the probability that no computer containing virus will be scanned in the course of the next five days?

1. 10 computers are scanned every day
2. 4% of all computers in the corporate network are scanned every day

* Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient
* Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient
* BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
* EACH statement ALONE is sufficient
* Statements (1) and (2) TOGETHER are NOT sufficient

Kudos [?]: 443 [0], given: 1

SVP
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Joined: 07 Nov 2007
Posts: 1790

Kudos [?]: 1088 [0], given: 5

Location: New York
Re: Computers and virus [#permalink]

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New post 09 May 2009, 22:12
agree with C.

when combined you know the total no.of computers to be scanned. (250)
so, you can find the probability
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Kudos [?]: 1088 [0], given: 5

Re: Computers and virus   [#permalink] 09 May 2009, 22:12
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15 computers in the corporate network are infected with

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