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# How many zeroes are in 10!*20!*30!

Author Message
SVP
Joined: 03 Feb 2003
Posts: 1603

Kudos [?]: 299 [0], given: 0

How many zeroes are in 10!*20!*30! [#permalink]

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20 May 2003, 01:26
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

How many zeroes are in 10!*20!*30! ?

Kudos [?]: 299 [0], given: 0

Intern
Joined: 29 Aug 2003
Posts: 29

Kudos [?]: 1 [0], given: 0

Location: Mumbai

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27 Nov 2003, 12:08
I get 13..

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Intern
Joined: 24 Nov 2003
Posts: 30

Kudos [?]: 12 [0], given: 0

Location: Champaign

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28 Nov 2003, 08:05
What logic did u guys use, yes its 13, I agree. I used some croked method to get to the answer.

Would love to hear a smart solution.

Kudos [?]: 12 [0], given: 0

Intern
Joined: 16 Sep 2003
Posts: 21

Kudos [?]: [0], given: 0

Location: Buffalo (NY)

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30 Nov 2003, 12:11
10! 10 itself + 2*5 =2
20! 20 + 12*15 and WHatever there is in 10!=4
30 30 + 22*25 ,here 25 has 2 fives hence this five can be combined with another 2 to get another zero + whatever we have in 20! = 7

2 + 4 + 7 = 13

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SVP
Joined: 03 Feb 2003
Posts: 1603

Kudos [?]: 299 [0], given: 0

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01 Dec 2003, 03:11
no official answer–the question is mine

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Manager
Joined: 22 Nov 2003
Posts: 54

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Location: New Orleans

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04 Dec 2003, 12:26
I'm curious.

Thanks,
CJ

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