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# can someone clarify this? Probability of selecting student

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Manager
Joined: 03 Jul 2006
Posts: 175

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can someone clarify this? Probability of selecting student [#permalink]

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12 Aug 2006, 07:23
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

can someone clarify this?

Probability of selecting student from senior class 60/1000 ==> CORRECT

but it also says,
the probability of selecting a member of the pair from junior class is 1/800.
Isn't it 60/800 ?

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Senior Manager
Joined: 14 Jul 2005
Posts: 401

Kudos [?]: 31 [0], given: 0

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12 Aug 2006, 11:18
Hi rkatl

The prob for selecting a senior from the class is number of senior siblings/ total number of students, hence 60/1000.

The second probability is 1/800 because the total set of juniors is 800 and there is only 1 matching sibling for the senior you have selected (although just selecting any sibling would be 60/800)

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Manager
Joined: 03 Jul 2006
Posts: 175

Kudos [?]: 31 [0], given: 0

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12 Aug 2006, 11:36
got it.. thanks, gmatornot

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12 Aug 2006, 11:36
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