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# If 3^x - 3^x-1 ,then x(x-1) = ? 1. 12 2. 16 3. 20 4. 30 5.

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Manager
Joined: 23 Jan 2008
Posts: 108
If 3^x - 3^x-1 ,then x(x-1) = ? 1. 12 2. 16 3. 20 4. 30 5. [#permalink]

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04 Feb 2008, 15:09
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If 3^x - 3^x-1 ,then x(x-1) = ?

1. 12
2. 16
3. 20
4. 30
5. 81

Last edited by blog on 05 Feb 2008, 11:27, edited 1 time in total.
Director
Joined: 05 Jan 2008
Posts: 688

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04 Feb 2008, 23:44
Could you post the question again, I think the question is incomplete
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CEO
Joined: 29 Mar 2007
Posts: 2559

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05 Feb 2008, 09:56
blog wrote:
If 3 power x - 3 power x-1 ,then x(x-1) = ?

1. 12
2. 16
3. 20
4. 30
5. 81

Ya I agree something is missing. Also can you use ^ for powers? Ex: 4 power 2 is 4^2.
Re: x(x-1) ?   [#permalink] 05 Feb 2008, 09:56
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