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# See attachment. OA will be provided later

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Manager
Joined: 23 Jun 2008
Posts: 140
See attachment. OA will be provided later [#permalink]

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11 Aug 2008, 14:26
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See attachment. OA will be provided later.
Attachments

DS1_081108.doc [67 KiB]

SVP
Joined: 30 Apr 2008
Posts: 1850
Location: Oklahoma City
Schools: Hard Knocks

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11 Aug 2008, 15:18
balboa,

you will get more responses if you type in the questions ratherthan attach as a .doc
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11 Aug 2008, 21:11
balboa wrote:
See attachment. OA will be provided later.

if d is a positive integer, f is the product of the first 30 positive integers,
what is the value of d?

(1) 10^d is a factor of f
(2) d > 6

product of first 30 integers = 30! = 30*29*.....1

1) is not sufficient
10^2 is factor (because 25*4 makes hundred)
10 ^3 is factor (because 5*3*25*4 makes 1000)

insufficient.
2) d>6 ... not sufficient

combine two.

TRY TO FIND all integers divisable by 5 ...
If you multiple 2 with any number divisable by 5..----> yield to number that must be divisable by 10

5, 10 15, 20, 25, 30
25 itself has two 5s

so there are 7 fives.

10^7 is factor of f.
d=7

What is OA
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Re: DS Question   [#permalink] 11 Aug 2008, 21:11
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