Any takers for this : PS Archive
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# Any takers for this

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Director
Joined: 08 Jun 2007
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11 Sep 2007, 19:04
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Any takers for this?
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VP
Joined: 10 Jun 2007
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Re: PS - Again from Gmat prep [#permalink]

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11 Sep 2007, 19:10
ashkrs wrote:
Any takers for this?

3^(4n+2) always give the unit digit of 1
Therefore, if you always have a unit digit of 1, knowing that m is less than 10 will be sufficient.

Ans = B
Director
Joined: 17 Sep 2005
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Re: PS - Again from Gmat prep [#permalink]

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11 Sep 2007, 19:19
bkk145 wrote:
ashkrs wrote:
Any takers for this?

3^(4n+2) always give the unit digit of 1
Therefore, if you always have a unit digit of 1, knowing that m is less than 10 will be sufficient.

Ans = B

I think, 3^(4n+2) will always give unit digit as 9. (For all +ve values of n)
So if m = 1 , remainder will always be 0.

Hence B is sufficient.

- Brajesh
Re: PS - Again from Gmat prep   [#permalink] 11 Sep 2007, 19:19
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