A city council will select 2 of 6 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?	Choose the most appropriate option
A) 36  B) 90  C) 144  D) 216  E) 432
OA D   6C2 * 6C1   using the combination formula to choose 2 from 9 and 1 from 6   90
<result>B</result>
A city council will select 2 of 6 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?