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

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Director
Director
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Joined: 22 Aug 2007
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A) 20 B) 24 C) 25 D) 30 E) 32 [#permalink] New post 20 Sep 2007, 09:36
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A) 20
B) 24
C) 25
D) 30
E) 32
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Senior Manager
Senior Manager
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Joined: 27 Aug 2007
Posts: 253
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Kudos [?]: 11 [0], given: 0

 [#permalink] New post 20 Sep 2007, 10:13
I think it is 24 = B,

Just count how many 5s there are.
Director
Director
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Re: how many zeros [#permalink] New post 20 Sep 2007, 22:59
IrinaOK wrote:
A) 20
B) 24
C) 25
D) 30
E) 32


Answer B.

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
Manager
Manager
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Joined: 10 Aug 2007
Posts: 63
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Re: how many zeros [#permalink] New post 20 Sep 2007, 23:13
GK_Gmat wrote:
IrinaOK wrote:
A) 20
B) 24
C) 25
D) 30
E) 32


Answer B.

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 :)
Director
Director
avatar
Joined: 22 Aug 2007
Posts: 569
Followers: 1

Kudos [?]: 20 [0], given: 0

Re: how many zeros [#permalink] New post 21 Sep 2007, 09:39
GK_Gmat wrote:
IrinaOK wrote:
A) 20
B) 24
C) 25
D) 30
E) 32


Answer B.

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!!
Re: how many zeros   [#permalink] 21 Sep 2007, 09:39
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