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M25 #29

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Location: United States (TX)
Concentration: Leadership, Sustainability
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Re: M25 #29 [#permalink] New post 10 Jul 2013, 06:35
This was probably one of the easiest GMAT questions I have done and has renewed my faith in getting a decent score.

1. X-Y A is clearly insufficient because the numbers could be all over the place. 11-9, 7-5, 5-3
2.y>x>6 (2 sets of numbers fulfill this scenario 5+3 no prime and 5+ 2 = prime) since 1 cannot be prime. B is insufficient

Thus D is insufficient

C or E

5-3 = prime 5-2 = prime

Since you have two possibilities C is insufficient

Thus E is the only answer.
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Re: M25 #29 [#permalink] New post 10 Jul 2013, 17:14
heartbeats1987 wrote:
petrifiedbutstanding wrote:
Some folks here say 1 is not a prime. But it is.


Natural numbers that have EXACTLY two factors are called prime numbers. Obviously, the number "1" has exactly 1 factor, so it is neither prime nor composite.. Yeah, this number is a different breed :roll: !!


"1" is neither prime nor composite, which is where i termed it as a "different breed", per se it does not lie within any of these two terminologies.. :)

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Re: M25 #29 [#permalink] New post 11 Jul 2013, 08:28
For 1. take two prime number with a combination of two odd( 5,3) and 1 odd and second one an even prime number (5,2), the results will be different for X+Y so insufficient
For 2. different value of X& Y possible so insufficient
For 1 & 2 more than 1 value is coming so insufficent
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Re: M25 #29 [#permalink] New post 12 Jul 2013, 18:51
Using A D | B C E we eliminate A , D and B Options right away. In isolation, none of the statements make sense. However, if we combine Option 1 and 2 Together what we are left with is Prime Numbers less than 6 and there are 3 of them 2,3 and 5, and given these numbers produce different kind of answers, it is impossible to conclude on an answer.

Please remember 1 is NOT a PRIME NUMBER. The Smallest Prime Number is 2.

Answer is E.
Re: M25 #29   [#permalink] 12 Jul 2013, 18:51
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