Which of the following is the lowest positive integer that

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Which of the following is the lowest positive integer that [#permalink]

05 Feb 2008, 15:05

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Which of the following is the lowest positive integer that is divisible by 2, 3, 4, 5, 6, 7, 8, and 9?
15,120
3,024
2,520
1,890
1,680

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Re: PS - Divisibility [#permalink]

05 Feb 2008, 15:07

JCLEONES wrote:

Which of the following is the lowest positive integer that is divisible by 2, 3, 4, 5, 6, 7, 8, and 9?
15,120
3,024
2,520
1,890
1,680

pull out the biggest numbers first
3^2
2^3
7
5

9*8*7*5 = 2,520
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Re: PS - Divisibility [#permalink]

05 Feb 2008, 15:26

Woah Woah woah...backup here. Biggest #s first. Can you elaborate on this problem. I believe this one came out of the OG 11.

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Re: PS - Divisibility [#permalink]

05 Feb 2008, 19:54

What do we pull the biggest #s? Any why not "6"?

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Re: PS - Divisibility [#permalink]

06 Feb 2008, 14:52

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JCLEONES wrote:

Which of the following is the lowest positive integer that is divisible by 2, 3, 4, 5, 6, 7, 8, and 9?
15,120
3,024
2,520
1,890
1,680

ok so lets break our divisors down into prime factors, i.e 2,3,2^2,5,3*2,7, 2^3,3^2

anything divisible by 3^2, will be divisible by 3, anything divisible by 2^3 will be divisible by 2, 2^2
anything divisible by 2 and 3 will be divisible by 6. so by multiplying 5*7* 2^3*3^2 = 2520 we will yield the LCD = 2520

now since 2520 is one of the options, bingo, this is the LOWEST POSITIVE INT ,i.e 1 ,as asked by the question

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Re: PS - Divisibility [#permalink]

06 Feb 2008, 15:43

Thanks like a dummy I didn't realize we were looking for the LCD!

Re: PS - Divisibility [#permalink] 06 Feb 2008, 15:43

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Which of the following is the lowest positive integer that

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Which of the following is the lowest positive integer that

Which of the following is the lowest positive integer that

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