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# Why do we need 2nd term here? Isn't 2 a prime number??? Term

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Manager
Joined: 09 Nov 2006
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Why do we need 2nd term here? Isn't 2 a prime number??? Term [#permalink]

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10 Jan 2007, 07:44
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Why do we need 2nd term here? Isn't 2 a prime number??? Term 1 must be enough?
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princeton (2).doc [68.5 KiB]

SVP
Joined: 01 May 2006
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10 Jan 2007, 10:42
No

The OA is correct ... Nothing is said about where we start the set. Indeed, it could be -1*2 the greastest or -1*3 or -1*7

The second statment clarifies this ambiguity as there is only 1 even that is a prime number : 2
Director
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Re: Another weird DS dfrom Princeton [#permalink]

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10 Jan 2007, 10:50
Why do we need 2nd term here? Isn't 2 a prime number??? Term 1 must be enough?

Lesson learned from the question is that -2, -3, -5, -7, -11 and so on are not prime and only +ve integers can be prime.
Manager
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10 Jan 2007, 11:25
Fig wrote:
No

The OA is correct ... Nothing is said about where we start the set. Indeed, it could be -1*2 the greastest or -1*3 or -1*7

The second statment clarifies this ambiguity as there is only 1 even that is a prime number : 2

Thanks, now I got it!
10 Jan 2007, 11:25
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