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

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SVP
SVP
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Joined: 03 Feb 2003
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How many zeroes are in 10!*20!*30! [#permalink] New post 20 May 2003, 00:26
How many zeroes are in 10!*20!*30! ?
Intern
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 [#permalink] New post 27 Nov 2003, 11:08
I get 13..
whats the official answer??
Intern
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 [#permalink] New post 28 Nov 2003, 07:05
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.
Intern
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 [#permalink] New post 30 Nov 2003, 11:11
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
SVP
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 [#permalink] New post 01 Dec 2003, 02:11
no official answer–the question is mine
Manager
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Please post an explanation [#permalink] New post 04 Dec 2003, 11:26
I'm curious.

Thanks,
CJ
Please post an explanation   [#permalink] 04 Dec 2003, 11:26
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How many zeroes are in 10!*20!*30!

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