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How many people are in room A ? (1) A total of 15 different

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Manager
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How many people are in room A ? (1) A total of 15 different [#permalink]  16 Oct 2008, 02:57
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How many people are in room A ?

(1) A total of 15 different pairs of people can be selected from the people in room A .

(2) If there were one fewer person in room A , a total of 10 different pairs of people could be selected from room A .

The answer can be D or E. Each statement is sufficient to answer the qs, but the answers are different for both of them , for the first its 30 and second its 21 , So shud it be D or E then ?
Manager
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Re: DS - simple but i am confused. [#permalink]  16 Oct 2008, 03:05
I think the answer is D:

1) 6! which make 15 diff pairs
2) 5! makes 10 diff pairs

So there are 6 people in room.
Re: DS - simple but i am confused.   [#permalink] 16 Oct 2008, 03:05
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