Posted by Jen on Friday, July 15, 2011 at 5:51pm.
Create a Euler diagram to determine whether the syllogism is valid or invalid.
Some musicians stay up late.
Greg is a musician.
Greg stays up late.

Math  bobpursley, Friday, July 15, 2011 at 5:55pm
some do , and some dont.

Math  Jen, Friday, July 15, 2011 at 5:57pm
so it is valid?

Math  bobpursley, Friday, July 15, 2011 at 5:58pm
hardly. some musicians go to bed early.
greg is a musician, greg goes to bed early. 
Math  Damon, Friday, July 15, 2011 at 8:38pm
you have a circle for musicians
you have a circle for staying up late
the circles overlap (musicians who stay up late are in the overlapping zone, the intersection)
in the zone common to the two circles, the intersection, you have Greg. 
Math  Jen, Friday, July 15, 2011 at 10:43pm
thank you Damon...the syllogism is invalid correct?