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If m is a positive odd integer between 2 and 30, then m is

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If m is a positive odd integer between 2 and 30, then m is [#permalink] New post 27 Nov 2005, 00:52
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If m is a positive odd integer between 2 and 30, then m is divisible by how many different positive prime integers?

1. m is not divisible by 3
2. m is not divisible by 5
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Re: Sorry for the typo on the DS [#permalink] New post 27 Nov 2005, 02:38
nickdawg wrote:
If m is a positive odd integer between 2 and 30, then m is divisible by how many different positive prime integers?

1. m is not divisible by 3
2. m is not divisible by 5


1.since m is odd and <30 , m is not divisible by 3, m can only be formed by product of any two of 1,5,7,9 ...as we know 5*7 , 7*9, 5*9 all > 30 ---> m can only be formed by product of 1 and 5,7,9 ---> m is divisible by 1 prime number --->suff

2. m=3 : 1 prime
m= 21 : 2 primes
---->insuff
A it is.
Re: Sorry for the typo on the DS   [#permalink] 27 Nov 2005, 02:38
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