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# Is q prime? (1) q is between 115 and 125 (2) q + 1 is not prime.

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Re: Is q prime? (1) q is between 115 and 125 (2) q + 1 is not prime. [#permalink]
theLucifer wrote:
1. Sufficient . only possible value is 119

2. Not sufficient.

Ans = (A)

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119 is divisible by 7

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Re: Is q prime? (1) q is between 115 and 125 (2) q + 1 is not prime. [#permalink]
123 is divisible by 3
A is sufficient to answer this question.

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Re: Is q prime? (1) q is between 115 and 125 (2) q + 1 is not prime. [#permalink]
Oops sorry there is no prime number between 115 and 125 .. basically I did everything wrong and still got the correct ans

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Re: Is q prime? (1) q is between 115 and 125 (2) q + 1 is not prime. [#permalink]
A) Sufficient with answer as NO. There is no prime in this range.

B) for all q Prime's q+1 will always be NOT Prime

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Re: Is q prime? (1) q is between 115 and 125 (2) q + 1 is not prime. [#permalink]
A) Sufficient as there is NO prime between 115 and 125
B) Insufficient as q can be prime or not prime if q+1 is Not prime
Ex. Let q=27, then q+1=28 so both q and q+1 are Not prime
Now let q=29, so q+1=30, here q is prime and q+1 is Not prime

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Re: Is q prime? (1) q is between 115 and 125 (2) q + 1 is not prime. [#permalink]
(1) provides us with clear understanding that any number from the given range NEVER can be prime.
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Re: Is q prime? (1) q is between 115 and 125 (2) q + 1 is not prime. [#permalink]
Bunuel wrote:
Is q prime?

(1) q is between 115 and 125
(2) q + 1 is not prime.

1) No primes btw 115 & 125 => No => Sufficient
2) 2,3 & 14,15 => Yes and No => Not sufficient

A

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Re: Is q prime? (1) q is between 115 and 125 (2) q + 1 is not prime. [#permalink]
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Re: Is q prime? (1) q is between 115 and 125 (2) q + 1 is not prime. [#permalink]
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