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

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SVP
Joined: 03 Feb 2003
Posts: 1611
Followers: 6

Kudos [?]: 74 [0], given: 0

How many zeroes are in 10!*20!*30! [#permalink]  20 May 2003, 00:26
How many zeroes are in 10!*20!*30! ?
Intern
Joined: 29 Aug 2003
Posts: 29
Location: Mumbai
Followers: 0

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

I get 13..
Intern
Joined: 24 Nov 2003
Posts: 30
Location: Champaign
Followers: 0

Kudos [?]: 2 [0], given: 0

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.
Intern
Joined: 16 Sep 2003
Posts: 22
Location: Buffalo (NY)
Followers: 0

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

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
SVP
Joined: 03 Feb 2003
Posts: 1611
Followers: 6

Kudos [?]: 74 [0], given: 0

no official answer–the question is mine
Manager
Joined: 22 Nov 2003
Posts: 54
Location: New Orleans
Followers: 1

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

I'm curious.

Thanks,
CJ
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