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# If x and y are positive integers such that x^2+y^2 is a prim

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Joined: 06 Dec 2012
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GMAT Date: 04-06-2013
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If x and y are positive integers such that x^2+y^2 is a prim  [#permalink]

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Updated on: 27 Feb 2013, 14:34
2
3
00:00

Difficulty:

75% (hard)

Question Stats:

56% (02:26) correct 44% (02:20) wrong based on 203 sessions

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If x and y are positive integers such that x^2+y^2 is a prime number less than 18, what is the value of y?

(1) x^2 + y^2 is a prime number
(2) x^2 - y^2 is a prime number

Originally posted by mun23 on 27 Feb 2013, 13:19.
Last edited by Bunuel on 27 Feb 2013, 14:34, edited 2 times in total.
Edited the question.
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Joined: 02 Sep 2009
Posts: 52108
Re: If x and y are positive integers such that x^2+y^2 is a prim  [#permalink]

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27 Feb 2013, 14:39
2
mun23 wrote:
If x and y are positive integers such that x^2+y^2 is a prime number less than 18, what is the value of y?

(1) x^2 + y^2 is a prime number
(2) x^2 - y^2 is a prime number

By trial and error:

Case #1.
x^2 + y^2 --> 3^2 + 2^2 = 13 = prime.
x^2 - y^2 --> 3^2 - 2^2 = 5 = prime.

Case #2.
x^2 + y^2 --> 2^2 + 1^2 = 5 = prime.
x^2 - y^2 --> 2^2 - 1^2 = 3 = prime.

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Re: If x and y are positive integers such that x^2+y^2 is a prim  [#permalink]

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30 Apr 2014, 18:08
Hey Bunuel,
The org question is incorrectly written. Here is the correct question:
If x and y are positive integers such that x^2+y^3 is a prime number less than 18, what is the value of y?

(1) x^2 + y^2 is a prime number
(2) x^2 - y^2 is a prime number
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Re: If x and y are positive integers such that x^2+y^2 is a prim  [#permalink]

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01 May 2014, 09:01
prsnt11 wrote:
Hey Bunuel,
The org question is incorrectly written. Here is the correct question:
If x and y are positive integers such that x^2+y^3 is a prime number less than 18, what is the value of y?

(1) x^2 + y^2 is a prime number
(2) x^2 - y^2 is a prime number

You could use the same numbers because 3^2 + 2^3 and 2^2 + 1^3 are also primes less than 18.
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If x and y are positive integers such that x²+y³ is a prime number les  [#permalink]

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04 Mar 2017, 00:19
If x and y are positive integers such that x²+y³ is a prime number less than 18, what is the value of y?

1. x² + y² is a prime number

2. x² - y² is a prime number
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Re: If x and y are positive integers such that x^2+y^2 is a prim  [#permalink]

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04 Mar 2017, 00:43
1
anairamitch1804 wrote:
If x and y are positive integers such that x²+y³ is a prime number less than 18, what is the value of y?

1. x² + y² is a prime number

2. x² - y² is a prime number

Merging topics. Please refer to the discussion above.
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Re: If x and y are positive integers such that x^2+y^2 is a prim  [#permalink]

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04 Mar 2017, 03:34
Prompt analysis
x and y are positive integers where x^2 +y^2 <18

superset
the value if y will be one of 1,2,3,4

translation
In order to find y, we need:
1# exact value of y
2# two equation two variable in x and y
3# any other property of y.

statement translation
St 1: x^2 +y^2 is prime number.(x,y) or (y,x) will be (1,4), (1,2), (2,3).INSUFFICIENT
St 2: x^2 -y^2 is prime number. (x,y) will be (3,2) , (2,1). INSUFFICIENT

St 1& St 2: we will get (x,y) be either (2,1) or (3,2). INSUFFICIENT.

Option E
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Re: If x and y are positive integers such that x^2+y^2 is a prim  [#permalink]

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17 Mar 2017, 12:09
Infer - Possible values of sum are 2,3,5,7,9,11,13,17

S-1) x = 2, y = 1 : 4+1 = 5 - Prime and y = 1
or x = 3, y = 2 : 9+8 = 17 and y =2. NS

S-2) x = 5, y = 2: 25-8 =17
or x = 6, y = 5: 36 - 25 = 11. NS

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Re: If x and y are positive integers such that x^2+y^2 is a prim &nbs [#permalink] 17 Mar 2017, 12:09
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