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Is the integer n a prime number?

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Is the integer n a prime number? [#permalink]

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New post 01 Jul 2016, 05:05
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Is the integer n a prime number?

(1) 24 \(\leq\) n \(\leq\) 28
(2) n is not divisible by 2 or 3


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Re: Is the integer n a prime number? [#permalink]

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New post 01 Jul 2016, 08:19
A

1)none of the numbers 24,25,26,27,28 are prime.so suff

2) there are many numbers not divisible by 2 or 3 foe e.g. 55 or 7(former is not prime latter is)
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Re: Is the integer n a prime number? [#permalink]

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New post 22 Nov 2016, 23:21
Great Official Question
Here we need to find whether the concern integer n is prime or not
Statement 1
[24,28]=n
n=> 24=> divisible by 2
n=> 25=> divisible by 5
n=26 => divisible by 2
n=27 => divisible by 3
n=28 => divisible by 2
hence n is never prime
Hence Sufficient

Statement 2
n=5
n=25
taking the above two test cases we can discard the statement.
P.S=> This statement is just saying that 2 and 3 are not prime factors of n.

Hence A
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Re: Is the integer n a prime number? [#permalink]

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New post 07 Mar 2018, 17:49
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Re: Is the integer n a prime number?   [#permalink] 07 Mar 2018, 17:49
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