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Factor simple problem

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by alltimeacheiver » Wed Feb 23, 2011 9:25 pm
If 65x = 32 × 52 × 13, which of the following is not
a factor of x?
3
6
9
13
15

The ans is 3^2*9= 45,

I marked ans 6 becoz we donot find any factor and also 13. Pls explain how we can eliminate 6
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by BarryLi » Wed Feb 23, 2011 10:37 pm
Are you sure the equation says 65x = 32 * 52 * 13?
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by alltimeacheiver » Wed Feb 23, 2011 11:12 pm
sorry it is 65x=3^2*5^2*13
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by Anurag@Gurome » Wed Feb 23, 2011 11:41 pm
alltimeacheiver wrote:sorry it is 65x=3^2*5^2*13
Since 65x = 3^2 * 5^2 * 13, x = 3^2 * 5.

From the options, it can be easily seen that 6 and 13 are not dividing 3^2 * 5.

The answers are 6 and 13.
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