Dijet and Inclusive jet cross section measurements and three jet event properties with CMS

1. We will present results related with the measurement of the inclusive jet cross sections, and the dijet production cross sections, at a centre of mass energy of 7 TeV with the entire 5 fb-1 data-set collected by the CMS experiment in 2011. 2. We will present results on the analysis and study of three jet properties, as well as the three-jet to two jet cross section ratio measurement at a centre of mass energy of 7 TeV with the entire 5 fb-1 dataset collected by the CMS experiment in 2011.