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exponents

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Manager
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Joined: 20 May 2008
Posts: 55
exponents [#permalink]

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New post 03 Feb 2009, 00:17
If n is a positive integer, what is the remainder when 38^n+3 + 2 is divided by 5?

A. 0
B. 1
C. 2
D. 3
E. 4

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Re: exponents [#permalink]

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New post 03 Feb 2009, 02:18
Maybe It is 38^4n+3
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Re: exponents [#permalink]

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New post 03 Feb 2009, 04:37
nope its not that..
the sums from set 1 - old gmat papers
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Re: exponents [#permalink]

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New post 03 Feb 2009, 05:21
LoyalWater wrote:
If n is a positive integer, what is the remainder when 38^n+3 + 2 is divided by 5?

A. 0
B. 1
C. 2
D. 3
E. 4


n=1
38^4 + 2 .. unit digit 6 +2 --> unit digit 8 --> remainder could be 3
n=2
38^4 + 2 .. unit digit 8 +2 --> unit digit 0 --> remainder could be 0

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Re: exponents   [#permalink] 03 Feb 2009, 05:21
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