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DS: P is the positive integer, Is P a prime number? 1. P+3

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Manager
Joined: 08 Apr 2004
Posts: 131
Location: Corea
Followers: 2

Kudos [?]: 742 [0], given: 0

DS: P is the positive integer, Is P a prime number? 1. P+3 [#permalink]

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07 Sep 2004, 07:34
00:00

Difficulty:

(N/A)

Question Stats:

100% (02:54) correct 0% (00:00) wrong based on 1 sessions

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DS: P is the positive integer, Is P a prime number?
1. P+3 is a prime number
2. (P^2) +3 is a prime number
Director
Joined: 20 Jul 2004
Posts: 592
Followers: 2

Kudos [?]: 137 [0], given: 0

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07 Sep 2004, 07:44
E?

1. P+3 is a prime number
If P = 2, P+3 = 5 (Prime) Ans: P is prime
If P = 4, P+3 = 7 (Prime) Ans: P is not prime

2. P^2+3 is a prime number
If P = 2, P^2+3 = 7 (Prime) Ans: P is prime
If P = 4, P^2+3 = 19 (Prime) Ans: P is not prime

Together
If P = 2, P+3 = 5 (Prime), P^2+3 = 7 (Prime) Ans: P is prime
If P = 4, P+3 = 7 (Prime), P^2+3 = 19 (Prime) Ans: P is not prime
Manager
Joined: 02 Apr 2004
Posts: 222
Location: Utrecht
Followers: 1

Kudos [?]: 21 [0], given: 0

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07 Sep 2004, 12:26
Yep, I have E as answer too.

Same method I used like hardworker.
This question costed me less than 2 minutes, and to be honest I like question like these to see on the real test.

Regards,

Alex
07 Sep 2004, 12:26
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DS: P is the positive integer, Is P a prime number? 1. P+3

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