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January 28, 2015

January 28, 2015

Posted by **Jen** on Monday, July 11, 2011 at 11:12pm.

If the bell rings, then we answer the door.

The bell rings.

We answer the door.

- Math-geometry -
**Max**, Monday, July 11, 2011 at 11:48pmYes, it is valid, according to the law of detachment. If the first and second premise are true, then the third is true.

- Math-geometry -
**Jen**, Monday, July 11, 2011 at 11:51pmOh okay now I understand. Thank you :)

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