A city council will select 2 of 9 available firefighters and 1 of 4 available police officers to serve on an advisory panel. How many different groups of 3 could serve on the panel? Choose one:
A) 36
B) 72
C) 144
D) 216
E) 432
OA D   91442 * 41441   using the combination formula to choose 2 from 9 and 1 from 4   144
<result>C</result>
A city council will select 2 of 9 available firefighters and 1 of 4 available police officers to serve on an advisory panel. How many different groups of 3 could serve on the panel?