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If x is odd, is x prime?

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Manager
Joined: 07 Jun 2017
Posts: 174
Location: India
Concentration: Technology, General Management
GMAT 1: 660 Q46 V38
GPA: 3.6
WE: Information Technology (Computer Software)
If x is odd, is x prime?  [#permalink]

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22 Sep 2017, 06:19
1
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Difficulty:

65% (hard)

Question Stats:

50% (01:38) correct 50% (02:08) wrong based on 49 sessions

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If x is odd, is x prime?

(1) The sum of the digits of x is 5
(2) x < 300

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Naveen
email: nkmungila@gmail.com
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Re: If x is odd, is x prime?  [#permalink]

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22 Sep 2017, 22:03
nkmungila wrote:
If x is odd, is x prime?

(1) The sum of the digits of x is 5
(2) x < 300

Statement 1: x can be 5, a prime no or x can be -5, a non prime number. Hence Insufficient

Statement 2: x can be any number, both prime and non prime. Hence Insufficient

Combining 1 & 2: Again x can be 5 or -5. Hence Insufficient

OPtion E
Senior Manager
Joined: 02 Jul 2017
Posts: 294
Concentration: Entrepreneurship, Technology
GMAT 1: 730 Q50 V38
If x is odd, is x prime?  [#permalink]

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23 Sep 2017, 01:16
1
If x is odd, is x prime?

(1) The sum of the digits of x is 5

=>odd numbers with sum of its digit 5 can be : 5,23,41,113,131,203,221,311,401...
So x can be prime or not.
Insufficient

(2) x < 300
Clearly not sufficient as only given information is that x is odd number and is less than 300.
Insufficient

(1)+(2)
Sum of digits of x is 5 and x < 300
we have numbers : 5,23,41,113,131 -> prime and 203,221 -> non prime
Insufficient

Senior Manager
Joined: 06 Jul 2016
Posts: 382
Location: Singapore
Concentration: Strategy, Finance
Re: If x is odd, is x prime?  [#permalink]

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16 Nov 2017, 12:00
nkmungila wrote:
If x is odd, is x prime?

(1) The sum of the digits of x is 5

x = 23 => x is prime.
x = 203 => x is not prime

Insufficient.

Quote:
(2) x < 300

x could be any odd number. Insufficient.

Quote:
combining both statements

x = 23 => x is prime
x = 203 => x is NOT prime.

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Re: If x is odd, is x prime? &nbs [#permalink] 16 Nov 2017, 12:00
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