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

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Is K=|K|? (1) K is prime (2) K is even [#permalink] New post 08 Jul 2004, 04:22
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D
E

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Is K=|K|?

(1) K is prime
(2) K is even
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 [#permalink] New post 08 Jul 2004, 04:54
I guess, Either statement can solve the equation.

Hence the answer is D
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 [#permalink] New post 08 Jul 2004, 06:05
(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.
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 [#permalink] New post 08 Jul 2004, 06:08
Are there negative prime numbers as well ??
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 [#permalink] New post 08 Jul 2004, 06:24
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.
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 [#permalink] New post 08 Jul 2004, 06:27
There are negative primes:

Please follow the link
http://users.aol.com/AmazingMazeMan/pri ... ative.html
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 [#permalink] New post 08 Jul 2004, 06:34
mba wrote:
There are negative primes:

Please follow the link
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,
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 [#permalink] New post 08 Jul 2004, 06:42
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.
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 [#permalink] New post 09 Jul 2004, 04:15
(A)
Prime number starts from 2.. ( No negative number)
Even numbers can be both -ve and +ve.
  [#permalink] 09 Jul 2004, 04:15
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Is K=|K|? (1) K is prime (2) K is even

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