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If n > 5, the units digit of the product of n consecutive

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Senior Manager
Joined: 19 Feb 2004
Posts: 413
Location: Lungi
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If n > 5, the units digit of the product of n consecutive [#permalink]

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19 Feb 2004, 08:28
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If n > 5, the units digit of the product of n consecutive numbers is -
a. odd
b. not divisible by 5
c. 2
d. 0
e. divisible by 7
SVP
Joined: 30 Oct 2003
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Location: NewJersey USA
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19 Feb 2004, 08:40
I would like to think 0

This is basically n!
for any n>5 n! has always 0 in the units digit.
4! = 24 which does not have a zero
Manager
Joined: 26 Dec 2003
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Location: India
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19 Feb 2004, 08:50
Has to be 0. Becoz there will be a number with 5 and and even number. and their product will be with the units digit has 0.
Director
Joined: 03 Jul 2003
Posts: 652
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19 Feb 2004, 12:59
Another good one.
Manager
Joined: 16 Jan 2004
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Location: NJ
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Kudos [?]: 0 [0], given: 0

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19 Feb 2004, 14:06
Agree. It should be 0
19 Feb 2004, 14:06
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