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# Is K=|K|? (1) K is prime (2) K is even

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SVP
Joined: 03 Feb 2003
Posts: 1604
Is K=|K|? (1) K is prime (2) K is even [#permalink]

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08 Jul 2004, 05:22
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Is K=|K|?

(1) K is prime
(2) K is even
Senior Manager
Joined: 25 Dec 2003
Posts: 359
Location: India

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08 Jul 2004, 05:54
I guess, Either statement can solve the equation.

_________________

Giving another SHOT

Senior Manager
Joined: 26 Jan 2004
Posts: 400
Location: India

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08 Jul 2004, 07:05
(E) it is,

1) K is prime, what if K=-3, not sufficient
2) K is even, what if K=-2 not sufficient.

Combining both 1) and 2), K can be 2, -2. Not sufficient.
Senior Manager
Joined: 05 Feb 2004
Posts: 290
Location: USA

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08 Jul 2004, 07:08
Are there negative prime numbers as well ??
SVP
Joined: 03 Feb 2003
Posts: 1604

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08 Jul 2004, 07:24
mba wrote:
(E) it is,

1) K is prime, what if K=-3, not sufficient
2) K is even, what if K=-2 not sufficient.

Combining both 1) and 2), K can be 2, -2. Not sufficient.

Guys, the question is simple and obvious. E is wrong. There are no negative primes. The smallest prime is 2.

Give it another try.
Senior Manager
Joined: 26 Jan 2004
Posts: 400
Location: India

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08 Jul 2004, 07:27
There are negative primes:

http://users.aol.com/AmazingMazeMan/pri ... ative.html
SVP
Joined: 03 Feb 2003
Posts: 1604

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08 Jul 2004, 07:34
mba wrote:
There are negative primes:

http://users.aol.com/AmazingMazeMan/pri ... ative.html

The link is interesting. It is the first time I have seen negative primes.
A number is prime if it has only two different divisors--1 and itself.
-5 can be evenly divided by 1, 5, -1, -5. So, it is out.

It is due to this definition that 1 is not a prime and that 2 is the smallest prime, although it is even,
Senior Manager
Joined: 26 Jan 2004
Posts: 400
Location: India

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08 Jul 2004, 07:42
Using same definition, we can say 5 is also not even as it is divisible by an integer, -5. (correct me if I am wrong).

When you say a prime is divisble by itself and 1 then that doesn't talk about signs.
Director
Joined: 05 Jul 2004
Posts: 894

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09 Jul 2004, 05:15
(A)
Prime number starts from 2.. ( No negative number)
Even numbers can be both -ve and +ve.
09 Jul 2004, 05:15
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