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A) 20 B) 24 C) 25 D) 30 E) 32

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Director
Joined: 22 Aug 2007
Posts: 566

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A) 20 B) 24 C) 25 D) 30 E) 32 [#permalink]

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20 Sep 2007, 10:36
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A) 20
B) 24
C) 25
D) 30
E) 32
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Kudos [?]: 72 [0], given: 0

Senior Manager
Joined: 27 Aug 2007
Posts: 253

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20 Sep 2007, 11:13
I think it is 24 = B,

Just count how many 5s there are.

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Director
Joined: 09 Aug 2006
Posts: 754

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20 Sep 2007, 23:59
IrinaOK wrote:
A) 20
B) 24
C) 25
D) 30
E) 32

Neat trick i learnt from the forum:

100/5 = 20
100/(5)^2 = 4

Total = 20+4 = 24

How many 0's in 200! ?

200/5 = 40
200/25 = 8
200/125 = 1 (w/ some remainder)

Total = 40+8+1 = 49

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Manager
Joined: 10 Aug 2007
Posts: 63

Kudos [?]: 3 [0], given: 0

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21 Sep 2007, 00:13
GK_Gmat wrote:
IrinaOK wrote:
A) 20
B) 24
C) 25
D) 30
E) 32

Neat trick i learnt from the forum:

100/5 = 20
100/(5)^2 = 4

Total = 20+4 = 24

How many 0's in 200! ?

200/5 = 40
200/25 = 8
200/125 = 1 (w/ some remainder)

Total = 40+8+1 = 49

I didn't know that. Thank you for sharing

Kudos [?]: 3 [0], given: 0

Director
Joined: 22 Aug 2007
Posts: 566

Kudos [?]: 72 [0], given: 0

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21 Sep 2007, 10:39
GK_Gmat wrote:
IrinaOK wrote:
A) 20
B) 24
C) 25
D) 30
E) 32

Neat trick i learnt from the forum:

100/5 = 20
100/(5)^2 = 4

Total = 20+4 = 24

How many 0's in 200! ?

200/5 = 40
200/25 = 8
200/125 = 1 (w/ some remainder)

Total = 40+8+1 = 49

GK_Gmat,
Thank you!!

Kudos [?]: 72 [0], given: 0

Re: how many zeros   [#permalink] 21 Sep 2007, 10:39
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A) 20 B) 24 C) 25 D) 30 E) 32

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