Question 144084

Sketch one circle to represent {{{Senators}}}. 
Sketch another circle, which partially overlaps the first, to represent {{{Conservationists}}}. 
The {{{overlapping}}}{{{ area}}} shows that {{{some}}}{{{ senators}}} are {{{conservationists}}}.

Since the second statement means that {{{all}}}{{{ conservationists }}}{{{are}}}{{{ not }}}{{{pro-development}}}, then it follows that {{{some}}}{{{ senators}}}{{{ are}}}{{{ not}}}{{{ pro-development}}}. 

So, the syllogism is {{{valid}}}.