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# Gmat prep

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Manager
Joined: 13 Jun 2009
Posts: 82
Location: Tu
Schools: Chicago b.

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03 Sep 2009, 09:34
1
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Hi everyone (congratulation with the past world day of knowledge)
Today I was working with the Prep and faced with the question that frustrated me . Here it's, below

my mental route
1) 1*2*3.......30=x*10^6 (2*5, 10, 12*15, 20, 22*25, 30)
2) hence, 10^6 is the maximum posible (10^) factor. :arrow: d6 makes no sense, so ... my answer is [b]E

May be the absence of the possible value meens that the answer is C ?
I tried to find the error in my path, but I can't. Need you help please.
Tnanx :wink:

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The greatest pleasure in life is doing what people say you cannot do...
Manager
Joined: 10 Aug 2009
Posts: 120

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03 Sep 2009, 11:29
d=7

1) $$30!=10^d\times integer$$ the trailing zeros will be dtermined by the power of 5 in the number 30!
and there exactly seven 5's in the f=30!
so we do not now the exact value of d...it can be 1 or 2 or 3 or...7

2) d>6...obviously not sufficient

1)+2)

we know that the maximum value of d=7 and d>6...hence d=7
Manager
Joined: 20 Aug 2009
Posts: 101

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03 Sep 2009, 11:52
LenaA wrote:
d=7

1) $$30!=10^d\times integer$$ the trailing zeros will be dtermined by the power of 5 in the number 30!
and there exactly seven 5's in the f=30!

Don't get this..
Manager
Joined: 13 Jun 2009
Posts: 82
Location: Tu
Schools: Chicago b.

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03 Sep 2009, 12:12
Leno4ka hi

Don't you think that there are 6 "five" in first 30?))) they are 1)5 2)10 3)15 4)20 5)25 6)30,
by the way 5*7=35 I think))) anyway thanks.

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The greatest pleasure in life is doing what people say you cannot do...
Manager
Joined: 10 Aug 2009
Posts: 120

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03 Sep 2009, 12:27
2
Ayrish wrote:
Leno4ka hi

Don't you think that there are 6 "five" in first 30?))) they are 1)5 2)10 3)15 4)20 5)25 6)30,
by the way 5*7=35 I think))) anyway thanks.

No Ayrish,

count 5's...lol

5=5
10=5*2
15=5*3
20=5*4
25=5*5
30=5*6
don't forget that 25 basically has 2 fives...
Manager
Joined: 13 Jun 2009
Posts: 82
Location: Tu
Schools: Chicago b.

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04 Sep 2009, 02:54
I got, thanx Lena!!! very nice.

--== Message from the GMAT Club Team ==--

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This discussion does not meet community quality standards. It has been retired.

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Joined: 09 Sep 2013
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30 Aug 2018, 05:58
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Gmat prep   [#permalink] 30 Aug 2018, 05:58
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