can you be in the 101st airborne and be in the 75th rangers also and what are the lapel pins look like and the

Answer 1

NOPE, but you CAN be a member of the 101st AND be RANGER qualifed. AND you can be a RANGER and NOT be AIRBORNE qualified (you have to be in the 10th mtn div known as "LEG" rangers) alot of people get the idea of the ADDITIONAL SKILL IDENTIFIERS mixed up with UNIT designations -So the 101st is an infantry UNIT and the 75th is an Infantry unit ,AIRBORNE is an additional skill identifier as well as RANGER is an additional skill identifier both come with "TABS" sewn on uniform above unit patch -you can be one or both

Answer 2

Nope. The 75th Ranger Regiment is a seperate unit with a seperate mission. See http://www.soc.mil/75thrr/75th_home.htm for more info.
Info on the 101st can be found at http://www.campbell.army.mil/division.htm .
Both show the designated unit insignia at the tops of those pages.