Name the following cycloalkenes using systematic names:?

I thought they were 1,3-methylcyclopentene, cyclohept-1,3-diene, and 3,6-methylcycloheptene, but it says that isn't right. Am I missing something?

http://www.chegg.com/homework-help/questions-and-answers/following-cycloalkenes-using-systematic-names-great-rating-help-q2979532

The first is 1.3-dimethylcyclopentene.

The second is 1,3-cyclohexadiene.
(http://webbook.nist.gov/cgi/cbook.cgi?ID...

The third is 3,6-dimethylcyclohexene.
http://webbook.nist.gov/cgi/cbook.cgi?ID...