A city council will select 2 of 7 available firefighters and 1 of 6 available police officers to serve on an advisory panel. How many different groups of 3 could serve on the panel?  Options.
A) 36 B) 72 C) 144 D) 216 E) 126
OA D   7C2 * 6C1   using the combination formula to choose 2 from 9 and 1 from 6   126
<result>E</result>
A city council will select 2 of 7 available firefighters and 1 of 6 available police officers to serve on an advisory panel. How many different groups of 3 could serve on the panel?