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N is a 3-digit positive integer, is N a prime number? 1) Its

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N is a 3-digit positive integer, is N a prime number? 1) Its [#permalink] New post   05 May 2006, 23:43
N is a 3-digit positive integer, is N a prime number?

1) Its tens'digit equal to hundreds' digit
2) Its units' digit is 3.



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Re: N is a 3-digit positive integer, is N a prime number? 1) Its [#permalink] New post   05 May 2006, 23:47
Answer is E!


From 1: 332, 331... or 221, 222!!

From 2: 333, 663 or 113!

Hence E!
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Re: N is a 3-digit positive integer, is N a prime number? 1) Its [#permalink] New post   06 May 2006, 18:12
Agree with C :wink:
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Re: N is a 3-digit positive integer, is N a prime number? 1) Its [#permalink] New post   19 Jun 2006, 18:24
stmt 1 - 332,551...insuff

stmt 2, 333,553,763 insuff

combining, insuff - E
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Re: N is a 3-digit positive integer, is N a prime number? 1) Its [#permalink] New post   20 Jun 2006, 04:49
1) XXY - not suff
2) XY3 - not suff
1+2) XX3 - includes 333, 663, 993 which are not prime numbers

therefore E
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Re: N is a 3-digit positive integer, is N a prime number? 1) Its [#permalink] New post   20 Jun 2006, 22:49
E is the desired choice. Combining I and II, 333 is a straight giveaway for N not being a prime.
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Re: N is a 3-digit positive integer, is N a prime number? 1) Its [#permalink] New post   21 Jun 2006, 14:50
from 1) we can have 110 which is not prime
from 2) we can have 103 again not prime

combining both we can have 663 not prime
therefore E.
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Re: N is a 3-digit positive integer, is N a prime number? 1) Its [#permalink] New post   24 Jun 2006, 06:59
1) as stated before 110 is not prime

2) 333 is not prime

combined 663 is not prime

E looks like the choice



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Re: N is a 3-digit positive integer, is N a prime number? 1) Its [#permalink]
24 Jun 2006, 06:59
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