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Re: Does the integer k have at least three different positive [#permalink]
27 Mar 2012, 02:07

Expert's post

Does the integer k have at least three different positive prime factors?

(1) k/15 is an integer --> since k is divisible by 3*5=15, then it's divisible by 3 and 5, hence k has at least those two prime factors, though it might have more (consider k=30). Not sufficient.

(2) k/10 is an integer --> since k is divisible by 2*5=10, then it's divisible by 2 and 5, hence k has at least those two prime factors, though it might have more (consider k=30). Not sufficient.

(1)+(2) At least 3 primes are factors of k: 2, 3, and 5. Sufficient.

Re: Does the integer k have at least three different positive [#permalink]
24 Mar 2013, 07:42

hi I understand the example 1. since K is divisible by 15, 3 AND 5 are the factors but what about 1?can't it be considered as one of the factors? Or it is not considered as one of the factors because the question mentions prime factor and 1 is not a prime no.?

Bunuel wrote:

Does the integer k have at least three different positive prime factors?

(1) k/15 is an integer --> since k is divisible by 3*5=15, then it's divisible by 3 and 5, hence k has at least those two prime factors, though it might have more (consider k=30). Not sufficient.

(2) k/10 is an integer --> since k is divisible by 2*5=10, then it's divisible by 2 and 5, hence k has at least those two prime factors, though it might have more (consider k=30). Not sufficient.

(1)+(2) At least 3 primes are factors of k: 2, 3, and 5. Sufficient.

Re: Does the integer k have at least three different positive [#permalink]
24 Mar 2013, 10:49

4112019 wrote:

hi I understand the example 1. since K is divisible by 15, 3 AND 5 are the factors but what about 1?can't it be considered as one of the factors? Or it is not considered as one of the factors because the question mentions prime factor and 1 is not a prime no.?

1 is one of the factors of K, but we are looking for "different positive prime factors", so 1 cannot be considered as it is not a prime number. _________________

It is beyond a doubt that all our knowledge that begins with experience.

Re: Does the integer k have at least three different positive [#permalink]
25 Mar 2013, 00:28

Expert's post

dzodzo85 wrote:

Does the integer k have at least three different positive prime factors?

(1) k/15 is an integer. (2) k/10 is an integer.

Maybe it is just me but I feel the answer should be E.

The question stem asks whether integer k has atleast 3 different ..... SO it is either a Yes or a No.

Now, taking F.S 1, we have k/15 is an integer. Thus, for k=0, we have a NO for the question stem. But, for k=30, we have a YES. Insufficient.

From F.S 2 , we have k/10 is an integer. Just as above, Insufficient. Taking both fact statements together, we have for k=0, a NO. Again, taking both statements together, for k=30 we have a YES. Insufficient

Re: Does the integer k have at least three different positive [#permalink]
25 Mar 2013, 00:33

1

This post received KUDOS

Expert's post

vinaymimani wrote:

dzodzo85 wrote:

Does the integer k have at least three different positive prime factors?

(1) k/15 is an integer. (2) k/10 is an integer.

Maybe it is just me but I feel the answer should be E.

The question stem asks whether integer k has atleast 3 different ..... SO it is either a Yes or a No.

Now, taking F.S 1, we have k/15 is an integer. Thus, for k=0, we have a NO for the question stem. But, for k=30, we have a YES. Insufficient.

From F.S 2 , we have k/10 is an integer. Just as above, Insufficient. Taking both fact statements together, we have for k=0, a NO. Again, taking both statements together, for k=30 we have a YES. Insufficient

Might be a blonde moment.

If k=0, then k is a multiple of all prime numbers: zero is a multiple of every integer (except zero itself). _________________

Re: Does the integer k have at least three different positive [#permalink]
25 Mar 2013, 01:14

Expert's post

Bunuel wrote:

vinaymimani wrote:

dzodzo85 wrote:

Does the integer k have at least three different positive prime factors?

(1) k/15 is an integer. (2) k/10 is an integer.

Maybe it is just me but I feel the answer should be E.

The question stem asks whether integer k has atleast 3 different ..... SO it is either a Yes or a No.

Now, taking F.S 1, we have k/15 is an integer. Thus, for k=0, we have a NO for the question stem. But, for k=30, we have a YES. Insufficient.

From F.S 2 , we have k/10 is an integer. Just as above, Insufficient. Taking both fact statements together, we have for k=0, a NO. Again, taking both statements together, for k=30 we have a YES. Insufficient

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