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rightmost non-zero digit

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Director
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Joined: 25 Oct 2008
Posts: 611
Location: Kolkata,India
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GMAT Tests User
rightmost non-zero digit [#permalink] New post 24 Aug 2009, 14:02
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 100% (01:23) wrong based on 4 sessions
What is the rightmost non-zero digit of 20!?
a) 2
b) 3
c) 5
d) 6
e) 8
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countdown-beginshas-ended-85483-40.html#p649902

Manager
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Joined: 10 Aug 2009
Posts: 130
Followers: 3

Kudos [?]: 54 [0], given: 10

Re: rightmost non-zero digit [#permalink] New post 24 Aug 2009, 17:04
I am getting 6.
I got 8 initially but now I am getting 6...
I am wondering if 6 or 8 is right or neither...lol
Manager
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Joined: 28 Jul 2009
Posts: 126
Location: India
Schools: NUS, NTU, SMU, AGSM, Melbourne School of Business
Followers: 6

Kudos [?]: 53 [0], given: 12

GMAT Tests User
Re: rightmost non-zero digit [#permalink] New post 24 Aug 2009, 21:53
tejal777 wrote:
What is the rightmost non-zero digit of 20!?
a) 2
b) 3
c) 5
d) 6
e) 8


It has already been discussed. Heres the link
ps-rightmost-nonzero-digit-product-of-factors-82401.html?view-post=617960#p617960
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Re: rightmost non-zero digit   [#permalink] 24 Aug 2009, 21:53
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