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Integer m has 4 different prime factors and n has 3

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Integer m has 4 different prime factors and n has 3 [#permalink]

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New post 01 Aug 2008, 04:33
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

. Integer m has 4 different prime factors and n has 3 different prime factors. If m and n has the greatest common prime factor of 15, how many different prime factors does m*n have?
A. 4
B. 5
C. 6
D. 7
E. 8

ignore the part in the red...
the ans should be 2common(3,5)along with 2 factors from m, and 1 from n
so 2+2+1=5

Last edited by arjtryarjtry on 01 Aug 2008, 08:55, edited 2 times in total.

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Re: prime factors ... [#permalink]

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New post 01 Aug 2008, 05:37
arjtryarjtry wrote:
If m and n has the greatest common prime factor of 15


I don't get this. 15 is the least common denominator or something else?
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Re: prime factors ... [#permalink]

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New post 01 Aug 2008, 06:35
arjtryarjtry wrote:
. Integer m has 4 different prime factors and n has 3 different prime factors. If m and n has the greatest common prime factor of 15, how many different prime factors does m*n have?
A. 4
B. 5
C. 6
D. 7
E. 8

Excuse me but 15 is not prime. What is the exact question ?

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Re: prime factors ... [#permalink]

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New post 01 Aug 2008, 08:38
arjtryarjtry wrote:
. Integer m has 4 different prime factors and n has 3 different prime factors. If m and n has the greatest common prime factor of 15, how many different prime factors does m*n have?
A. 4
B. 5
C. 6
D. 7
E. 8



I got B


M 3 * 5 * 7 * 11
N 2 * 3* 5
M *N --> 2*3*5*7*11 PRIM FACTORS
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Re: prime factors ... [#permalink]

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New post 01 Aug 2008, 08:45
Oski wrote:
arjtryarjtry wrote:
. Integer m has 4 different prime factors and n has 3 different prime factors. If m and n has the greatest common prime factor of 15, how many different prime factors does m*n have?
A. 4
B. 5
C. 6
D. 7
E. 8

Excuse me but 15 is not prime. What is the exact question ?

Looks like question intention is
greatest common prime factor of 15 = 3 * 5 great common prime factors of m and n
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Re: prime factors ... [#permalink]

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New post 01 Aug 2008, 08:54
sorry guys.. the error will be rectified...

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Re: prime factors ...   [#permalink] 01 Aug 2008, 08:54
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Integer m has 4 different prime factors and n has 3

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